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Note 5 - Commitments and Contingencies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]      
Operating Leases, Rent Expense, Net $ 2,100,000us-gaap_OperatingLeasesRentExpenseNet $ 2,000,000us-gaap_OperatingLeasesRentExpenseNet $ 2,200,000us-gaap_OperatingLeasesRentExpenseNet
Purchase Obligation, Due in Next Twelve Months 3,100,000us-gaap_PurchaseObligationDueInNextTwelveMonths    
Loss Contingency Accrual $ 0us-gaap_LossContingencyAccrualAtCarryingValue