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Note 13 - Stockholders' Equity (Details) - Weighted Average Fair Value Assumptions
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Weighted Average Fair Value Assumptions [Abstract]      
Volatility 43.14%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate 46.24%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate 48.23%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
Risk-free interest rate 1.85%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate 1.39%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate 2.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Dividend yield 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Pre-vest cancellation rate *) 4.17%dspg_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsPrevestCancellationRate [1] 3.48%dspg_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsPrevestCancellationRate [1] 3.50%dspg_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsPrevestCancellationRate [1]
Post-vest cancellation rate **) 4.09%dspg_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsPostvestCancellationRate [2] 2.52%dspg_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsPostvestCancellationRate [2] 2.58%dspg_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsPostvestCancellationRate [2]
Suboptimal exercise factor ***) 1.61%dspg_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsSuboptimalExerciseFactor [3] 1.81%dspg_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsSuboptimalExerciseFactor [3] 1.60%dspg_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsSuboptimalExerciseFactor [3]
Expected life (years) 3 years 98 days 4 years 240 days 4 years 69 days
[1] The pre-vest cancellation rate was calculated on an annual basis and is presented here on an annual basis.
[2] The post-vest cancellation rate was calculated on a monthly basis and is presented here on an annual basis.
[3] The ratio of the stock price to strike price at the time of exercise of the option.