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Note 10 - Allocation of Share-based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended 228 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2031
Restricted Stock Units (RSUs) [Member]      
Stock-based compensation $ 3,148 $ 4,528 $ 6,239
Restructuring charges (3,148) (4,528) (6,239)
Employee Stock Purchase Plan [Member]      
Stock-based compensation 54 44 149
Restructuring charges (54) (44) (149)
Employee Stock Option [Member]      
Stock-based compensation 6 100 128
Restructuring charges (6) (100) (128)
Cost of Sales [Member]      
Stock-based compensation 668 861 1,041
Restructuring charges (668) (861) (1,041)
Research and Development Expense [Member]      
Stock-based compensation 1,339 1,744 2,118
Restructuring charges (1,339) (1,744) (2,118)
Selling, General and Administrative Expenses [Member]      
Stock-based compensation 1,201 2,067 3,428
Restructuring charges $ (1,201) $ (2,067) (3,428)
Restructuring Charges [Member]      
Stock-based compensation 71
Restructuring charges (71)
Stock-based compensation $ 3,208 $ 4,672 6,516
Restructuring charges $ (3,208) $ (4,672) $ (6,516)