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Note 11 - Accrued Pension Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]      
Defined Benefit Plan, Corridor Percentage 10.00%dspg_DefinedBenefitPlanCorridorPercentage    
Defined Benefit Plan Actuarial Net Gains Losses Recognized $ 209dspg_DefinedBenefitPlanActuarialNetGainsLossesRecognized $ 11dspg_DefinedBenefitPlanActuarialNetGainsLossesRecognized $ 160dspg_DefinedBenefitPlanActuarialNetGainsLossesRecognized