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Note 9 - Stock-based Compensation - Stock Options Exercised (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Proceeds from issuance of common stock upon exercise of stock options $ 5 $ 132 $ 142
Fair value of shares received upon exercise of stock options 262 421 612 441
Tax benefit (expense) related to stock options exercised (10) 87 (12) 324
Intrinsic value of stock options exercised $ 44 $ 291 $ 156 $ 96