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Note 15 - Taxes On Income (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 15 - Taxes On Income (Details) [Line Items]      
Current Foreign Tax Expense (Benefit) $ (1,672,000)us-gaap_CurrentForeignTaxExpenseBenefit [1] $ 507,000us-gaap_CurrentForeignTaxExpenseBenefit [1] $ 304,000us-gaap_CurrentForeignTaxExpenseBenefit [1]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (827,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount    
Income Tax Expense (Benefit) (2,841,000)us-gaap_IncomeTaxExpenseBenefit (150,000)us-gaap_IncomeTaxExpenseBenefit (172,000)us-gaap_IncomeTaxExpenseBenefit
Deferred Tax Assets, Valuation Allowance 33,115,000us-gaap_DeferredTaxAssetsValuationAllowance 36,886,000us-gaap_DeferredTaxAssetsValuationAllowance  
Cash and Cash Equivalents,Marketable Securities,and Time Deposit 124,300,000dspg_CashAndCashEquivalentsMarketableSecuritiesAndTimeDeposit    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 1,031,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 1,892,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 135,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 408,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations 858,000us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 284,000us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 622,000us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Approved Enterprise [Member] | Israel Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Tax Exemption Period 2 years    
Corporate Tax Rate 10.00%dspg_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember
/ us-gaap_InvestmentTypeAxis
= dspg_ApprovedEnterpriseMember		    
Additional Tax Exemption Period 8 years    
Approved Enterprise [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Number of Investments 6dspg_NumberOfInvestments
/ us-gaap_InvestmentTypeAxis
= dspg_ApprovedEnterpriseMember		    
Beneficiary Enterprise [Member] | Israel Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Tax Exemption Period 4 years    
Corporate Tax Rate 25.00%dspg_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember
/ us-gaap_InvestmentTypeAxis
= dspg_BeneficiaryEnterpriseMember		    
Additional Tax Exemption Period 6 years    
Beneficiary Enterprise [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Number of Investments 2dspg_NumberOfInvestments
/ us-gaap_InvestmentTypeAxis
= dspg_BeneficiaryEnterpriseMember		    
First, Second, Third, Fourth, Fifth and Sixth Investment Programs [Member] | Minimum [Member] | Israel Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Tax Exemption Period   2 years  
Corporate Tax Rate   10.00%dspg_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember
/ us-gaap_InvestmentTypeAxis
= dspg_FirstSecondThirdFourthFifthAndSixthInvestmentProgramsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Additional Tax Exemption Period   6 years  
First, Second, Third, Fourth, Fifth and Sixth Investment Programs [Member] | Maximum [Member] | Israel Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Tax Exemption Period   4 years  
Corporate Tax Rate   25.00%dspg_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember
/ us-gaap_InvestmentTypeAxis
= dspg_FirstSecondThirdFourthFifthAndSixthInvestmentProgramsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Additional Tax Exemption Period   8 years  
Seventh and Eighth Investment Programs [Member] | Minimum [Member] | Israel Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Corporate Tax Rate 10.00%dspg_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember
/ us-gaap_InvestmentTypeAxis
= dspg_SeventhAndEighthInvestmentProgramsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Seventh and Eighth Investment Programs [Member] | Maximum [Member] | Israel Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Corporate Tax Rate 25.00%dspg_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember
/ us-gaap_InvestmentTypeAxis
= dspg_SeventhAndEighthInvestmentProgramsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Seventh and Eighth Investment Programs [Member] | Israel Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Tax Exemption Period 2 years    
Additional Tax Exemption Period 8 years    
Preferred Enterprises [Member] | Israel Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Corporate Tax Rate 16.00%dspg_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember
/ us-gaap_InvestmentTypeAxis
= dspg_PreferredEnterprisesMember		    
Dividend Tax Rate 20.00%dspg_DividendTaxRate
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember
/ us-gaap_InvestmentTypeAxis
= dspg_PreferredEnterprisesMember		    
Non Qualified Stock Options [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Income Tax Expense (Benefit) 0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementClassOfStockAxis
= dspg_NonQualifiedStockOptionsMember		 0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementClassOfStockAxis
= dspg_NonQualifiedStockOptionsMember		 0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementClassOfStockAxis
= dspg_NonQualifiedStockOptionsMember
Domestic Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Operating Loss Carryforwards 12,012us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
Foreign Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Operating Loss Carryforwards 2,515us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Investment held by Foreign Entities [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Cash and Cash Equivalents,Marketable Securities,and Time Deposit 108,800,000dspg_CashAndCashEquivalentsMarketableSecuritiesAndTimeDeposit
/ invest_InvestmentAxis
= dspg_InvestmentHeldByForeignEntitiesMember		    
Valuation Allowance, Tax Credit Carryforward [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Current Foreign Tax Expense (Benefit) (1,234,000)us-gaap_CurrentForeignTaxExpenseBenefit
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceTaxCreditCarryforwardMember		    
Minimum [Member] | Swiss Federal Tax Administration (FTA) [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Foreign Reduced Tax Rates 10.00%dspg_ForeignReducedTaxRates
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_SwissFederalTaxAdministrationFTAMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Minimum [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Tax Credit Carryforward, Expiration Period 15 years    
Maximum [Member] | Swiss Federal Tax Administration (FTA) [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Foreign Reduced Tax Rates 15.00%dspg_ForeignReducedTaxRates
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_SwissFederalTaxAdministrationFTAMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Maximum [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Tax Credit Carryforward, Expiration Period 20 years    
Finalization of Tax Assessment [Member] | Israel Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Income Tax Expense (Benefit) (858,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember
/ us-gaap_NatureOfExpenseAxis
= dspg_FinalizationOfTaxAssessmentMember		    
Israel Tax Authority [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Current Foreign Tax Expense (Benefit) (858,000)us-gaap_CurrentForeignTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember		    
Percentage of Export Sales to Get Tax Benefit 25.00%dspg_PercentageOfExportSalesToGetTaxBenefit
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember		    
Corporate Tax Rate 26.50%dspg_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember		 25.00%dspg_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember		 25.00%dspg_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount 33,293us-gaap_IncomeTaxReconciliationTaxExemptIncome
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember		    
Income Tax, Net Liabilities 3,699dspg_IncomeTaxNetLiabilities
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember		    
Operating Loss Carryforwards 24,236us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_IsraelTaxAuthorityMember		    
Swiss Federal Tax Administration (FTA) [Member]      
Note 15 - Taxes On Income (Details) [Line Items]      
Deferred Tax, Amortization Period 10 years    
Operating Loss Carryforwards $ 215,450us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_SwissFederalTaxAdministrationFTAMember		    
Capital Loss Carryforward, Expiration Period 7 years    
[1] Includes (i) income in the amount of $858 due to reversal of income tax contingency reserves that were determined to be no longer needed due to finalization of a tax assessment of one of the Company's subsidiaries and (ii) income in the amount of $1,234 due to removal of valuation allowance of tax advances.