<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.19.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>270</ContextCount>
  <ElementCount>460</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>98</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>5</UnitCount>
  <MyReports>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-consolidated-balance-sheets-</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-consolidated-balance-sheets-parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-consolidated-statements-of-operations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Consolidated Statements of Operations (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-consolidated-statements-of-operations-parentheticals</Role>
      <ShortName>Consolidated Statements of Operations (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Consolidated Statements of Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-consolidated-statements-of-comprehensive-income-loss</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Statement - Statements of Changes in Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-statements-of-changes-in-stockholders-equity</Role>
      <ShortName>Statements of Changes in Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-consolidated-statements-of-cash-flows-</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Supplemental Cash Flow Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-supplemental-cash-flow-information-</Role>
      <ShortName>Supplemental Cash Flow Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 1 - General</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-1-general</Role>
      <ShortName>Note 1 - General</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 2 - Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies</Role>
      <ShortName>Note 2 - Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 3 - Marketable Securities and Time Deposits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-3-marketable-securities-and-time-deposits</Role>
      <ShortName>Note 3 - Marketable Securities and Time Deposits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 4 - Other Accounts Receivable and Prepaid Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-4-other-accounts-receivable-and-prepaid-expenses</Role>
      <ShortName>Note 4 - Other Accounts Receivable and Prepaid Expenses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 5 - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-5-inventories</Role>
      <ShortName>Note 5 - Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 6 - Property and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-6-property-and-equipment</Role>
      <ShortName>Note 6 - Property and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Note 7 - Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-7-intangible-assets</Role>
      <ShortName>Note 7 - Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 8 - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-8-fair-value-measurements</Role>
      <ShortName>Note 8 - Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Note 9 - Accrued Expenses and Other Accounts Payable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-9-accrued-expenses-and-other-accounts-payable</Role>
      <ShortName>Note 9 - Accrued Expenses and Other Accounts Payable</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Note 10 - Accrued Pension Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-10-accrued-pension-liabilities</Role>
      <ShortName>Note 10 - Accrued Pension Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Note 11 - Financial Income, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-11-financial-income-net</Role>
      <ShortName>Note 11 - Financial Income, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Note 12 - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-12-stockholders-equity</Role>
      <ShortName>Note 12 - Stockholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>021 - Disclosure - Note 13 - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-13-commitments-and-contingencies</Role>
      <ShortName>Note 13 - Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>022 - Disclosure - Note 14 - Taxes on Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-14-taxes-on-income</Role>
      <ShortName>Note 14 - Taxes on Income</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>023 - Disclosure - Note 15 - Basic and Diluted Loss Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-15-basic-and-diluted-loss-per-share</Role>
      <ShortName>Note 15 - Basic and Diluted Loss Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>024 - Disclosure - Note 16 - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-16-segment-information</Role>
      <ShortName>Note 16 - Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>025 - Disclosure - Note 17 - Subsequent Event</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-17-subsequent-event</Role>
      <ShortName>Note 17 - Subsequent Event</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>026 - Disclosure - Schedule II - Valuation and Qualifying Accounts</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts</Role>
      <ShortName>Schedule II - Valuation and Qualifying Accounts</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>027 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-significant-accounting-policies-policies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>028 - Disclosure - Supplemental Cash Flow Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-supplemental-cash-flow-information-tables</Role>
      <ShortName>Supplemental Cash Flow Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-supplemental-cash-flow-information-</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>029 - Disclosure - Note 1 - General (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-1-general-tables</Role>
      <ShortName>Note 1 - General (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-1-general</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>030 - Disclosure - Note 2 - Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies-tables</Role>
      <ShortName>Note 2 - Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>031 - Disclosure - Note 3 - Marketable Securities and Time Deposits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-3-marketable-securities-and-time-deposits-tables</Role>
      <ShortName>Note 3 - Marketable Securities and Time Deposits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-3-marketable-securities-and-time-deposits</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>032 - Disclosure - Note 4 - Other Accounts Receivable and Prepaid Expenses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-4-other-accounts-receivable-and-prepaid-expenses-tables</Role>
      <ShortName>Note 4 - Other Accounts Receivable and Prepaid Expenses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-4-other-accounts-receivable-and-prepaid-expenses</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>033 - Disclosure - Note 5 - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-5-inventories-tables</Role>
      <ShortName>Note 5 - Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-5-inventories</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>034 - Disclosure - Note 6 - Property and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-6-property-and-equipment-tables</Role>
      <ShortName>Note 6 - Property and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-6-property-and-equipment</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>035 - Disclosure - Note 7 - Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-7-intangible-assets-tables</Role>
      <ShortName>Note 7 - Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-7-intangible-assets</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>036 - Disclosure - Note 8 - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-8-fair-value-measurements-tables</Role>
      <ShortName>Note 8 - Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-8-fair-value-measurements</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>037 - Disclosure - Note 9 - Accrued Expenses and Other Accounts Payable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-9-accrued-expenses-and-other-accounts-payable-tables</Role>
      <ShortName>Note 9 - Accrued Expenses and Other Accounts Payable (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-9-accrued-expenses-and-other-accounts-payable</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>038 - Disclosure - Note 10 - Accrued Pension Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-10-accrued-pension-liabilities-tables</Role>
      <ShortName>Note 10 - Accrued Pension Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-10-accrued-pension-liabilities</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>039 - Disclosure - Note 11 - Financial Income, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-11-financial-income-net-tables</Role>
      <ShortName>Note 11 - Financial Income, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-11-financial-income-net</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>040 - Disclosure - Note 12 - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-12-stockholders-equity-tables</Role>
      <ShortName>Note 12 - Stockholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-12-stockholders-equity</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>041 - Disclosure - Note 13 - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-13-commitments-and-contingencies-tables</Role>
      <ShortName>Note 13 - Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-13-commitments-and-contingencies</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>042 - Disclosure - Note 14 - Taxes on Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-14-taxes-on-income-tables</Role>
      <ShortName>Note 14 - Taxes on Income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-14-taxes-on-income</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>043 - Disclosure - Note 15 - Basic and Diluted Loss Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-15-basic-and-diluted-loss-per-share-tables</Role>
      <ShortName>Note 15 - Basic and Diluted Loss Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-15-basic-and-diluted-loss-per-share</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>044 - Disclosure - Note 16 - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-16-segment-information-tables</Role>
      <ShortName>Note 16 - Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-16-segment-information</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>045 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts-tables</Role>
      <ShortName>Schedule II - Valuation and Qualifying Accounts (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>046 - Disclosure - Supplemental Cash Flow Information (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-supplemental-cash-flow-information-details-textual</Role>
      <ShortName>Supplemental Cash Flow Information (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-supplemental-cash-flow-information-tables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>047 - Disclosure - Supplemental Cash Flow Information - Value of Assets Acquired and Liabilities Assumed (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-supplemental-cash-flow-information-value-of-assets-acquired-and-liabilities-assumed-details</Role>
      <ShortName>Supplemental Cash Flow Information - Value of Assets Acquired and Liabilities Assumed (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>048 - Disclosure - Note 1 - General (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-1-general-details-textual</Role>
      <ShortName>Note 1 - General (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-1-general-tables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>049 - Disclosure - Note 1 - General - Sales as Percentage of the Company's Total Revenue by Major Customers (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-1-general-sales-as-percentage-of-the-companys-total-revenue-by-major-customers-details</Role>
      <ShortName>Note 1 - General - Sales as Percentage of the Company's Total Revenue by Major Customers (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>050 - Disclosure - Note 2 - Significant Accounting Policies (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies-details-textual</Role>
      <ShortName>Note 2 - Significant Accounting Policies (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies-tables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>051 - Disclosure - Note 2 - Significant Accounting Policies - Property and Equipment Depreciation Rates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies-property-and-equipment-depreciation-rates-details</Role>
      <ShortName>Note 2 - Significant Accounting Policies - Property and Equipment Depreciation Rates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>052 - Disclosure - Note 2 - Significant Accounting Policies - Impact of New Standard on Consolidated Balance Sheet and Consolidated Statements of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies-impact-of-new-standard-on-consolidated-balance-sheet-and-consolidated-statements-of-operations-details</Role>
      <ShortName>Note 2 - Significant Accounting Policies - Impact of New Standard on Consolidated Balance Sheet and Consolidated Statements of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>053 - Disclosure - Note 2 - Significant Accounting Policies - Fair Value of the Outstanding Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies-fair-value-of-the-outstanding-derivative-instruments-details</Role>
      <ShortName>Note 2 - Significant Accounting Policies - Fair Value of the Outstanding Derivative Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>054 - Disclosure - Note 2 - Significant Accounting Policies - Effect of Derivative Instruments in Cash Flow Hedging Transactions on Income and Other Comprehensive Income Gains (Losses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies-effect-of-derivative-instruments-in-cash-flow-hedging-transactions-on-income-and-other-comprehensive-income-gains-losses-details</Role>
      <ShortName>Note 2 - Significant Accounting Policies - Effect of Derivative Instruments in Cash Flow Hedging Transactions on Income and Other Comprehensive Income Gains (Losses) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>055 - Disclosure - Note 2 - Significant Accounting Policies - Gains (Losses) on Derivatives Reclassified from OCI to Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies-gains-losses-on-derivatives-reclassified-from-oci-to-income-details</Role>
      <ShortName>Note 2 - Significant Accounting Policies - Gains (Losses) on Derivatives Reclassified from OCI to Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies-tables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>056 - Disclosure - Note 2 - Significant Accounting Policies - Changes in Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies-changes-in-accumulated-other-comprehensive-income-loss-details</Role>
      <ShortName>Note 2 - Significant Accounting Policies - Changes in Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>057 - Disclosure - Note 2 - Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-2-significant-accounting-policies-reclassifications-out-of-accumulated-other-comprehensive-income-details</Role>
      <ShortName>Note 2 - Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>058 - Disclosure - Note 3 - Marketable Securities and Time Deposits (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-3-marketable-securities-and-time-deposits-details-textual</Role>
      <ShortName>Note 3 - Marketable Securities and Time Deposits (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-3-marketable-securities-and-time-deposits-tables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>059 - Disclosure - Note 3 - Marketable Securities and Time Deposits - Marketable Securities and Time Deposits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-3-marketable-securities-and-time-deposits-marketable-securities-and-time-deposits-details</Role>
      <ShortName>Note 3 - Marketable Securities and Time Deposits - Marketable Securities and Time Deposits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>060 - Disclosure - Note 3 - Marketable Securities and Time Deposits - Marketable Debt Securities by Contractual Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-3-marketable-securities-and-time-deposits-marketable-debt-securities-by-contractual-maturities-details</Role>
      <ShortName>Note 3 - Marketable Securities and Time Deposits - Marketable Debt Securities by Contractual Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>061 - Disclosure - Note 4 - Other Accounts Receivable and Prepaid Expenses - Other Accounts Receivable and Prepaid Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-4-other-accounts-receivable-and-prepaid-expenses-other-accounts-receivable-and-prepaid-expenses-details</Role>
      <ShortName>Note 4 - Other Accounts Receivable and Prepaid Expenses - Other Accounts Receivable and Prepaid Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>062 - Disclosure - Note 5 - Inventories (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-5-inventories-details-textual</Role>
      <ShortName>Note 5 - Inventories (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-5-inventories-tables</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>063 - Disclosure - Note 5 - Inventories - Components of Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-5-inventories-components-of-inventories-details</Role>
      <ShortName>Note 5 - Inventories - Components of Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>064 - Disclosure - Note 6 - Property and Equipment (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-6-property-and-equipment-details-textual</Role>
      <ShortName>Note 6 - Property and Equipment (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-6-property-and-equipment-tables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>065 - Disclosure - Note 6 - Property and Equipment - Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-6-property-and-equipment-property-and-equipment-details</Role>
      <ShortName>Note 6 - Property and Equipment - Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>066 - Disclosure - Note 7 - Intangible Assets (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-7-intangible-assets-details-textual</Role>
      <ShortName>Note 7 - Intangible Assets (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-7-intangible-assets-tables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>067 - Disclosure - Note 7 - Intangible Assets - Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-7-intangible-assets-intangible-assets-details</Role>
      <ShortName>Note 7 - Intangible Assets - Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>068 - Disclosure - Note 7 - Intangible Assets - Estimated Amortization Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-7-intangible-assets-estimated-amortization-expenses-details</Role>
      <ShortName>Note 7 - Intangible Assets - Estimated Amortization Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>069 - Disclosure - Note 8 - Fair Value Measurements - Fair Value Measurements of Assets and Liabilities on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-8-fair-value-measurements-fair-value-measurements-of-assets-and-liabilities-on-recurring-basis-details</Role>
      <ShortName>Note 8 - Fair Value Measurements - Fair Value Measurements of Assets and Liabilities on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>070 - Disclosure - Note 9 - Accrued Expenses and Other Accounts Payable - Accrued Expenses and Other Accounts Payable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-9-accrued-expenses-and-other-accounts-payable-accrued-expenses-and-other-accounts-payable-details</Role>
      <ShortName>Note 9 - Accrued Expenses and Other Accounts Payable - Accrued Expenses and Other Accounts Payable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>071 - Disclosure - Note 10 - Accrued Pension Liabilities (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-10-accrued-pension-liabilities-details-textual</Role>
      <ShortName>Note 10 - Accrued Pension Liabilities (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-10-accrued-pension-liabilities-tables</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>072 - Disclosure - Note 10 - Accrued Pension Liabilities - Changes in the Pension Plans' Benefit Obligation and Fair Value of Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-10-accrued-pension-liabilities-changes-in-the-pension-plans-benefit-obligation-and-fair-value-of-assets-details</Role>
      <ShortName>Note 10 - Accrued Pension Liabilities - Changes in the Pension Plans' Benefit Obligation and Fair Value of Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>073 - Disclosure - Note 10 - Accrued Pension Liabilities - Assumptions Used in the Measurement of the Pension Expense and Benefit Obligation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-10-accrued-pension-liabilities-assumptions-used-in-the-measurement-of-the-pension-expense-and-benefit-obligation-details</Role>
      <ShortName>Note 10 - Accrued Pension Liabilities - Assumptions Used in the Measurement of the Pension Expense and Benefit Obligation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>074 - Disclosure - Note 10 - Accrued Pension Liabilities - Components of Net Periodic Benefit Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-10-accrued-pension-liabilities-components-of-net-periodic-benefit-costs-details</Role>
      <ShortName>Note 10 - Accrued Pension Liabilities - Components of Net Periodic Benefit Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>075 - Disclosure - Note 10 - Accrued Pension Liabilities - Net Amounts Recognized in Consolidated Balance Sheets and Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-10-accrued-pension-liabilities-net-amounts-recognized-in-consolidated-balance-sheets-and-accumulated-other-comprehensive-income-loss-details</Role>
      <ShortName>Note 10 - Accrued Pension Liabilities - Net Amounts Recognized in Consolidated Balance Sheets and Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>076 - Disclosure - Note 10 - Accrued Pension Liabilities - Estimated Amount That will Amortized from Accumulated Other Comprehensive Income (Loss) into Net Periodic Benefit Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-10-accrued-pension-liabilities-estimated-amount-that-will-amortized-from-accumulated-other-comprehensive-income-loss-into-net-periodic-benefit-cost-details</Role>
      <ShortName>Note 10 - Accrued Pension Liabilities - Estimated Amount That will Amortized from Accumulated Other Comprehensive Income (Loss) into Net Periodic Benefit Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>077 - Disclosure - Note 10 - Accrued Pension Liabilities - Benefit Payments Expected to Be Paid (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-10-accrued-pension-liabilities-benefit-payments-expected-to-be-paid-details</Role>
      <ShortName>Note 10 - Accrued Pension Liabilities - Benefit Payments Expected to Be Paid (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>078 - Disclosure - Note 11 - Financial Income, Net - Components of Financial Income, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-11-financial-income-net-components-of-financial-income-net-details</Role>
      <ShortName>Note 11 - Financial Income, Net - Components of Financial Income, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>079 - Disclosure - Note 12 - Stockholders' Equity (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-12-stockholders-equity-details-textual</Role>
      <ShortName>Note 12 - Stockholders' Equity (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-12-stockholders-equity-tables</ParentRole>
      <Position>80</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>080 - Disclosure - Note 12 - Stockholders' Equity - Number of Shares Available for Future Issuance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-12-stockholders-equity-number-of-shares-available-for-future-issuance-details</Role>
      <ShortName>Note 12 - Stockholders' Equity - Number of Shares Available for Future Issuance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>081 - Disclosure - Note 12 - Stockholders' Equity - Stock Options, SARs and RSUs Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-12-stockholders-equity-stock-options-sars-and-rsus-activity-details</Role>
      <ShortName>Note 12 - Stockholders' Equity - Stock Options, SARs and RSUs Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>082 - Disclosure - Note 12 - Stockholders' Equity - Stock Options and SARs Outstanding by Exercise Price Range (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-12-stockholders-equity-stock-options-and-sars-outstanding-by-exercise-price-range-details</Role>
      <ShortName>Note 12 - Stockholders' Equity - Stock Options and SARs Outstanding by Exercise Price Range (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>083 - Disclosure - Note 12 - Stockholders' Equity - Weighted Average Fair Value Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-12-stockholders-equity-weighted-average-fair-value-assumptions-details</Role>
      <ShortName>Note 12 - Stockholders' Equity - Weighted Average Fair Value Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>084 - Disclosure - Note 12 - Stockholders' Equity - Non-vested Stock Options, SARs and RSUs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-12-stockholders-equity-nonvested-stock-options-sars-and-rsus-details</Role>
      <ShortName>Note 12 - Stockholders' Equity - Non-vested Stock Options, SARs and RSUs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>085 - Disclosure - Note 13 - Commitments and Contingencies (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-13-commitments-and-contingencies-details-textual</Role>
      <ShortName>Note 13 - Commitments and Contingencies (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-13-commitments-and-contingencies-tables</ParentRole>
      <Position>86</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>086 - Disclosure - Note 13 - Commitments and Contingencies - Future Minimum Lease Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-13-commitments-and-contingencies-future-minimum-lease-payments-details</Role>
      <ShortName>Note 13 - Commitments and Contingencies - Future Minimum Lease Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>087 - Disclosure - Note 14 - Taxes on Income (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-14-taxes-on-income-details-textual</Role>
      <ShortName>Note 14 - Taxes on Income (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-14-taxes-on-income-tables</ParentRole>
      <Position>88</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>088 - Disclosure - Note 14 - Taxes on Income - Provision for Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-14-taxes-on-income-provision-for-income-taxes-details</Role>
      <ShortName>Note 14 - Taxes on Income - Provision for Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>089 - Disclosure - Note 14 - Taxes on Income - Income (Loss) Before Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-14-taxes-on-income-income-loss-before-taxes-details</Role>
      <ShortName>Note 14 - Taxes on Income - Income (Loss) Before Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>090 - Disclosure - Note 14 - Taxes on Income - Income Tax Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-14-taxes-on-income-income-tax-reconciliation-details</Role>
      <ShortName>Note 14 - Taxes on Income - Income Tax Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>091 - Disclosure - Note 14 - Taxes on Income - Income Tax Reconciliation (Details) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-14-taxes-on-income-income-tax-reconciliation-details-parentheticals</Role>
      <ShortName>Note 14 - Taxes on Income - Income Tax Reconciliation (Details) (Parentheticals)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>092 - Disclosure - Note 14 - Taxes on Income - Deferred Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-14-taxes-on-income-deferred-tax-assets-and-liabilities-details</Role>
      <ShortName>Note 14 - Taxes on Income - Deferred Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>093 - Disclosure - Note 14 - Taxes on Income - Uncertain Tax Positions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-14-taxes-on-income-uncertain-tax-positions-details</Role>
      <ShortName>Note 14 - Taxes on Income - Uncertain Tax Positions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>094 - Disclosure - Note 15 - Basic and Diluted Loss Per Share - Net Income (Loss) Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-15-basic-and-diluted-loss-per-share-net-income-loss-per-share-details</Role>
      <ShortName>Note 15 - Basic and Diluted Loss Per Share - Net Income (Loss) Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>095 - Disclosure - Note 16 - Segment Information (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-16-segment-information-details-textual</Role>
      <ShortName>Note 16 - Segment Information (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-16-segment-information-tables</ParentRole>
      <Position>96</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>096 - Disclosure - Note 16 - Segment Information - Selected Operating Results (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-16-segment-information-selected-operating-results-details</Role>
      <ShortName>Note 16 - Segment Information - Selected Operating Results (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>097 - Disclosure - Note 16 - Segment Information - Reconciliation of Segment Operating Results (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-16-segment-information-reconciliation-of-segment-operating-results-details</Role>
      <ShortName>Note 16 - Segment Information - Reconciliation of Segment Operating Results (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>098 - Disclosure - Note 16 - Segment Information - Summary of Operations Within Geographic Areas Based on Customer Locations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-16-segment-information-summary-of-operations-within-geographic-areas-based-on-customer-locations-details</Role>
      <ShortName>Note 16 - Segment Information - Summary of Operations Within Geographic Areas Based on Customer Locations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>099 - Disclosure - Note 16 - Segment Information - Summary of Long-lived Assets Within Geographic Areas Based on the Assets' Locations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-16-segment-information-summary-of-longlived-assets-within-geographic-areas-based-on-the-assets-locations-details</Role>
      <ShortName>Note 16 - Segment Information - Summary of Long-lived Assets Within Geographic Areas Based on the Assets' Locations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>100 - Disclosure - Note 17 - Subsequent Event (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-note-17-subsequent-event-details-textual</Role>
      <ShortName>Note 17 - Subsequent Event (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-note-17-subsequent-event</ParentRole>
      <Position>101</Position>
    </Report>
    <Report instance="dspg-20181231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>101 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dspg.com/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts-details</Role>
      <ShortName>Schedule II - Valuation and Qualifying Accounts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.dspg.com/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts-tables</ParentRole>
      <Position>102</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>dspg-20181231.xml</File>
    <File>dspg-20181231.xsd</File>
    <File>dspg-20181231_cal.xml</File>
    <File>dspg-20181231_def.xml</File>
    <File>dspg-20181231_lab.xml</File>
    <File>dspg-20181231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/us-gaap/2018-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2018-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/invest/2013-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/country/2017-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2018-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
