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Note 1 - Organization and Significant Accounting Policies - Equity-based Compensation Expenses Related to Stock Options, SARs, RSUs and Employee Stock Purchase Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Total equity-based compensation expense $ 10,367 $ 8,693 $ 6,236
Cost of Sales [Member]      
Total equity-based compensation expense 588 459 246
Research and Development Expense [Member]      
Total equity-based compensation expense 5,141 3,839 2,860
Sales and Marketing [Member]      
Total equity-based compensation expense 1,587 1,428 922
General and Administrative Expense [Member]      
Total equity-based compensation expense $ 3,051 $ 2,967 $ 2,208