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Note 9 - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Options, Outstanding (in shares) 349,983 461,919 495,517  
Weighted average exercise price, Outstanding (in dollars per share) $ 10.97 $ 9.80 $ 9.33  
Weighted average remaining contractual life, Outstanding 1 year 259 days 2 years 73 days 2 years 102 days 2 years 266 days
Granted during period (in shares) 43,064 46,402  
Weighted average exercise price, Granted (in dollars per share) $ 14.67 $ 10.64  
Options, Exercised (in shares) (55,000) (155,000) (45,000)  
Weighted average exercise price, Exercised (in dollars per share) $ 8 $ 8.52 $ 6.70  
Forfeited/Expired (in shares) (25,000)   (35,000)  
Forfeited/Expired (in dollars per share) $ 14.08   $ 8.20  
Options, Outstanding (in shares) 269,983 349,983 461,919 495,517
Weighted average exercise price, Outstanding (in dollars per share) $ 11.29 $ 10.97 $ 9.80 $ 9.33
Average intrinsic value, Outstanding $ 221,397      
Options, vested (in shares) 269,983      
Weighted average exercise price, vested (in dollars per share) $ 11.29      
Weighted average remaining contractual life, vested 1 year 259 days      
Average intrinsic value, vested $ 221,397