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Note 8 - Stockholders' Equity - Allocation of the Recognized Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based compensation expense $ 25,956 $ 14,360 $ 8,067
Research and Development Expense [Member]      
Share-based compensation expense 11,316 4,701 3,329
General and Administrative Expense [Member]      
Share-based compensation expense 7,402 6,282 2,532
Selling and Marketing Expense [Member]      
Share-based compensation expense $ 7,238 $ 3,377 $ 2,206