<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.19.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>118</ContextCount>
  <ElementCount>287</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>51</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="stri-20190630.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.strsolar.com/20190630/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Current Period Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-condensed-consolidated-statements-of-comprehensive-income-loss-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-condensed-consolidated-statements-of-comprehensive-income-loss-unaudited-parentheticals</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Disclosure - Note 1 - Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-1-basis-of-presentation</Role>
      <ShortName>Note 1 - Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Note 2 - Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-2-significant-accounting-policies</Role>
      <ShortName>Note 2 - Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Note 3 - Loss Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-3-loss-per-share</Role>
      <ShortName>Note 3 - Loss Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 4 - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-4-inventories</Role>
      <ShortName>Note 4 - Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 5 - Long-lived Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-5-longlived-assets</Role>
      <ShortName>Note 5 - Long-lived Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 6 - Assets Held for Sale</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-6-assets-held-for-sale</Role>
      <ShortName>Note 6 - Assets Held for Sale</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 7 - Accrued Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-7-accrued-liabilities</Role>
      <ShortName>Note 7 - Accrued Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 8 - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-8-commitments-and-contingencies</Role>
      <ShortName>Note 8 - Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 9 - Cost-reduction Actions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-9-costreduction-actions</Role>
      <ShortName>Note 9 - Cost-reduction Actions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Note 10 - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-10-fair-value-measurements</Role>
      <ShortName>Note 10 - Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 11 - Factoring Arrangement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-11-factoring-arrangement</Role>
      <ShortName>Note 11 - Factoring Arrangement</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Note 12 - Long-term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-12-longterm-debt</Role>
      <ShortName>Note 12 - Long-term Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Note 13 - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-13-income-taxes</Role>
      <ShortName>Note 13 - Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Note 14 - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-14-stockholders-equity</Role>
      <ShortName>Note 14 - Stockholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Note 15 - Stock-based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-15-stockbased-compensation</Role>
      <ShortName>Note 15 - Stock-based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>021 - Disclosure - Note 16 - Geographical Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-16-geographical-information</Role>
      <ShortName>Note 16 - Geographical Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>022 - Disclosure - Note 17 - Related Party Transaction</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-17-related-party-transaction</Role>
      <ShortName>Note 17 - Related Party Transaction</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>023 - Disclosure - Note 18 - Subsequent Event</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-18-subsequent-event-</Role>
      <ShortName>Note 18 - Subsequent Event</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>024 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-significant-accounting-policies-policies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-2-significant-accounting-policies</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>025 - Disclosure - Note 3 - Loss Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-3-loss-per-share-tables</Role>
      <ShortName>Note 3 - Loss Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-3-loss-per-share</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>026 - Disclosure - Note 4 - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-4-inventories-tables</Role>
      <ShortName>Note 4 - Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-4-inventories</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>027 - Disclosure - Note 7 - Accrued Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-7-accrued-liabilities-tables</Role>
      <ShortName>Note 7 - Accrued Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-7-accrued-liabilities</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>028 - Disclosure - Note 9 - Cost-reduction Actions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-9-costreduction-actions-tables</Role>
      <ShortName>Note 9 - Cost-reduction Actions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-9-costreduction-actions</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>029 - Disclosure - Note 10 - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-10-fair-value-measurements-tables</Role>
      <ShortName>Note 10 - Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-10-fair-value-measurements</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>030 - Disclosure - Note 14 - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-14-stockholders-equity-tables</Role>
      <ShortName>Note 14 - Stockholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-14-stockholders-equity</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>031 - Disclosure - Note 15 - Stock-based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-15-stockbased-compensation-tables</Role>
      <ShortName>Note 15 - Stock-based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-15-stockbased-compensation</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>032 - Disclosure - Note 16 - Geographical Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-16-geographical-information-tables</Role>
      <ShortName>Note 16 - Geographical Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-16-geographical-information</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>033 - Disclosure - Note 1 - Basis of Presentation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-1-basis-of-presentation-details-textual</Role>
      <ShortName>Note 1 - Basis of Presentation (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-1-basis-of-presentation</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>034 - Disclosure - Note 2 - Significant Accounting Policies (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-2-significant-accounting-policies-details-textual</Role>
      <ShortName>Note 2 - Significant Accounting Policies (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>035 - Disclosure - Note 3 - Loss Per Share (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-3-loss-per-share-details-textual</Role>
      <ShortName>Note 3 - Loss Per Share (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-3-loss-per-share-tables</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>036 - Disclosure - Note 3 - Loss Per Share - Net Loss Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-3-loss-per-share-net-loss-per-share-details</Role>
      <ShortName>Note 3 - Loss Per Share - Net Loss Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>037 - Disclosure - Note 4 - Inventories - Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-4-inventories-inventories-details</Role>
      <ShortName>Note 4 - Inventories - Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>038 - Disclosure - Note 5 - Long-lived Assets (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-5-longlived-assets-details-textual</Role>
      <ShortName>Note 5 - Long-lived Assets (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-5-longlived-assets</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>039 - Disclosure - Note 6 - Assets Held for Sale (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-6-assets-held-for-sale-details-textual</Role>
      <ShortName>Note 6 - Assets Held for Sale (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-6-assets-held-for-sale</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>040 - Disclosure - Note 7 - Accrued Liabilities - Accrued Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-7-accrued-liabilities-accrued-liabilities-details</Role>
      <ShortName>Note 7 - Accrued Liabilities - Accrued Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>041 - Disclosure - Note 8 - Commitments and Contingencies (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-8-commitments-and-contingencies-details-textual</Role>
      <ShortName>Note 8 - Commitments and Contingencies (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-8-commitments-and-contingencies</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>042 - Disclosure - Note 9 - Cost-reduction Actions (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-9-costreduction-actions-details-textual</Role>
      <ShortName>Note 9 - Cost-reduction Actions (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-9-costreduction-actions-tables</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>043 - Disclosure - Note 9 - Cost-reduction Actions - Schedule of Restructuring Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-9-costreduction-actions-schedule-of-restructuring-costs-details</Role>
      <ShortName>Note 9 - Cost-reduction Actions - Schedule of Restructuring Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>044 - Disclosure - Note 10 - Fair Value Measurements - Fair Value Measurements of Financial Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-10-fair-value-measurements-fair-value-measurements-of-financial-assets-and-liabilities-details</Role>
      <ShortName>Note 10 - Fair Value Measurements - Fair Value Measurements of Financial Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>045 - Disclosure - Note 11 - Factoring Arrangement (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-11-factoring-arrangement-details-textual</Role>
      <ShortName>Note 11 - Factoring Arrangement (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-11-factoring-arrangement</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>046 - Disclosure - Note 12 - Long-term Debt (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-12-longterm-debt-details-textual</Role>
      <ShortName>Note 12 - Long-term Debt (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-12-longterm-debt</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>047 - Disclosure - Note 13 - Income Taxes (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-13-income-taxes-details-textual</Role>
      <ShortName>Note 13 - Income Taxes (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-13-income-taxes</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>048 - Disclosure - Note 14 - Stockholders' Equity (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-14-stockholders-equity-details-textual</Role>
      <ShortName>Note 14 - Stockholders' Equity (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-14-stockholders-equity-tables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>049 - Disclosure - Note 14 - Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-14-stockholders-equity-schedule-of-changes-in-stockholders-equity-details</Role>
      <ShortName>Note 14 - Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>050 - Disclosure - Note 15 - Stock-based Compensation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-15-stockbased-compensation-details-textual</Role>
      <ShortName>Note 15 - Stock-based Compensation (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-15-stockbased-compensation-tables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>051 - Disclosure - Note 15 - Stock-based Compensation - Summary of Stock Options Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-15-stockbased-compensation-summary-of-stock-options-activity-details</Role>
      <ShortName>Note 15 - Stock-based Compensation - Summary of Stock Options Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>052 - Disclosure - Note 15 - Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-15-stockbased-compensation-schedule-of-stockbased-compensation-expense-details</Role>
      <ShortName>Note 15 - Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>053 - Disclosure - Note 16 - Geographical Information (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-16-geographical-information-details-textual</Role>
      <ShortName>Note 16 - Geographical Information (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-16-geographical-information-tables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>054 - Disclosure - Note 16 - Geographical Information - Schedule of Operations by Geographic Area (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-16-geographical-information-schedule-of-operations-by-geographic-area-details</Role>
      <ShortName>Note 16 - Geographical Information - Schedule of Operations by Geographic Area (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>055 - Disclosure - Note 16 - Geographical Information - Schedule of Long-lived Assets by Geographic Area (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-16-geographical-information-schedule-of-longlived-assets-by-geographic-area-details</Role>
      <ShortName>Note 16 - Geographical Information - Schedule of Long-lived Assets by Geographic Area (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>056 - Disclosure - Note 17 - Related Party Transaction (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-17-related-party-transaction-details-textual</Role>
      <ShortName>Note 17 - Related Party Transaction (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-17-related-party-transaction</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="stri-20190630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>057 - Disclosure - Note 18 - Subsequent Event (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.strsolar.com/20190630/role/statement-note-18-subsequent-event-details-textual</Role>
      <ShortName>Note 18 - Subsequent Event (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.strsolar.com/20190630/role/statement-note-18-subsequent-event-</ParentRole>
      <Position>58</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>stri-20190630.xml</File>
    <File>stri-20190630.xsd</File>
    <File>stri-20190630_cal.xml</File>
    <File>stri-20190630_def.xml</File>
    <File>stri-20190630_lab.xml</File>
    <File>stri-20190630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/country/2017-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2019-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
