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Note 4 - Stockholders' Equity (Details) - Allocation of Recognized Period Costs (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocation of Recognized Period Costs $ 1,709 $ 1,319 $ 3,018 $ 2,224
Cost of Sales [Member]
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocation of Recognized Period Costs 649 432 1,183 751
Research and Development Expense [Member]
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocation of Recognized Period Costs 337 251 659 438
Selling, General and Administrative Expenses [Member]
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocation of Recognized Period Costs $ 723 $ 636 $ 1,176 $ 1,035