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Note 9 - Stock-based Compensation (Details) - Non-full Value Awards, All of Which Have Been Granted As Stock Options - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Non-full Value Awards, All of Which Have Been Granted As Stock Options [Abstract]    
Outstanding at December 31, 2014 154,915  
Outstanding at December 31, 2014 $ 15.19  
Outstanding at September 30, 2015 109,790  
Outstanding at September 30, 2015 $ 16.12  
Outstanding at September 30, 2015 2 years 219 days  
Outstanding at September 30, 2015 [1] $ 428  
Granted 0 0
Granted $ 0  
Exercised (45,125)  
Exercised $ 12.92  
Forfeited 0  
Forfeited $ 0  
[1] The intrinsic value of a stock option is the difference between the fair value of the underlying stock and the exercise price of the option.