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Note 9 - Stock-based Compensation (Details) - Stock Options Exercised - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stock Options Exercised [Abstract]        
Proceeds from stock options exercised $ 142 $ 87 $ 142 $ 429
Fair value of shares received upon exercised of stock options   812 20 1,290
Tax benefit related to stock options exercised 8 24 9 93
Intrinsic value of stock options exercised $ 31 $ 105 $ 33 $ 317