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Note 12 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Outstanding (in shares) 66,098 86,348 164,098
Outstanding (in dollars per share) $ 10.92 $ 11.09 $ 10.99
Exercised (in shares) (7,917) (20,250) (77,708)
Exercised (in dollars per share) $ 11.41 $ 11.65 $ 10.88
Canceled/forfeited/expired (in shares) (2,050)    
Canceled/forfeited/expired (in dollars per share) $ 10.91    
Outstanding (in shares) 56,131 66,098 86,348
Outstanding (in dollars per share) $ 10.85 $ 10.92 $ 11.09
Outstanding (Year) 3 years 73 days    
Outstanding [1] $ 849,026    
Options exercisable (in shares) 43,331    
Options exercisable (in dollars per share) $ 10.84    
Fully vested and exercisable (Year) 2 years 219 days    
Fully vested and exercisable [1] $ 656,002    
[1] The intrinsic value of a stock option is the amount by which the market value of the underlying stock exceeds the exercise price of the option. The per share market value of our common stock, as determined by the closing price on December 31, 2016, was $25.98.