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Note 11 - Stock-based Compensation - Stock Options Exercised (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Proceeds from stock options exercised $ 6 $ 328
Fair value of shares received upon exercise of stock options 8 37 1,380
Tax benefit related to stock options exercised 1 39 185
Intrinsic value of stock options exercised $ 9 $ 96 $ 841