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Note 6 - Income Taxes (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Note 6 - Income Taxes (Details) [Line Items]      
Income Tax Expense Benefit Period Increase Decrease $ 1,200,000    
Income Tax Expense (Benefit) 3,039,000 1,848,000  
Effective Income Tax Rate Reconciliation, Percent 32.70% 28.09%  
Income Tax Credits and Adjustments 0    
Unrecognized Tax Benefits 10,000,000   10,200,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 6,100,000   6,300,000
Unrecognized Tax Benefits In Long Term Liabilities 2,700,000    
Unrecognized Tax Benefits In Deferred Tax Assets 7,800,000    
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance 3,900,000    
Research Tax Credit Carryforward [Member]
      
Note 6 - Income Taxes (Details) [Line Items]      
Income Tax Credits and Adjustments   $ 400,000