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Note 9 - Share-based Payments - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of shares, outstanding at beginning of period (in shares) 764,430 850,232  
Weighted average exercise price, beginning of period (in dollars per share) $ 8.78 $ 8.06  
Weighted average remaining contractual term (Year) 5 years 102 days 6 years 175 days 5 years 284 days
Aggregate intrinsic value   $ 1,038 $ 3,001
Number of shares, granted (in shares) 105,000  
Weighted average exercise price, granted (in dollars per share) $ 9.90  
Number of shares, expired and canceled (in shares) (106,108) (3,144)  
Weighted average exercise price, expired and canceled (in dollars per share) $ 7.56 $ 10.29  
Number of shares, forfeited prior to vesting (in shares) (34,066) (8,996)  
Weighted average exercise price, forfeited prior to vesting (in dollars per share) $ 10.79 $ 11.01  
Number of shares, exercised (in shares) (178,662)  
Weighted average exercise price, exercised (in dollars per share) $ 5.90  
Number of shares, outstanding at end of period (in shares) 624,256 764,430 850,232
Weighted average exercise price, end of period (in dollars per share) $ 8.87 $ 8.78 $ 8.06
Number of shares, vested and expected to vest (in shares) 624,256 764,430  
Weighted average exercise price, vested and expected to vest (in dollars per share) $ 8.87 $ 8.78  
Weighted average remaining contractual term, vested and expected to vest (Year) 5 years 102 days 6 years 175 days  
Aggregate intrinsic value, vested and expected to vest   $ 1,038  
Number of shares, vested at end of period (in shares) 548,045 529,669  
Weighted average exercise price, vested at end of period (in dollars per share) $ 8.62 $ 7.89  
Weighted average remaining contractual term, vested (Year) 4 years 328 days 5 years 182 days  
Aggregate intrinsic value, vested   $ 1,033