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Note 9 - Share-based Payments - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of shares, outstanding at beginning of period (in shares) 850,232 1,028,935 1,040,081  
Weighted average exercise price, beginning of period (in dollars per share) $ 8.06 $ 6.03 $ 5.65  
Weighted average remaining contractual term (Year) 6 years 175 days 5 years 284 days 4 years 266 days 5 years 219 days
Aggregate intrinsic value $ 1,038 $ 3,001 $ 7,104 $ 4,286
Number of shares, granted (in shares) 105,000 217,700 56,666  
Weighted average exercise price, granted (in dollars per share) $ 9.90 $ 11.73 $ 13.03  
Number of shares, reinstated (in shares)     4,583  
Weighted average exercise price, reinstated (in dollars per share)     $ 4.47  
Number of shares, expired and canceled (in shares) (3,144) (4,186) (1,000)  
Weighted average exercise price, expired and canceled (in dollars per share) $ 10.29 $ 12.03 $ 3.42  
Number of shares, forfeited prior to vesting (in shares) (8,996) (17,360) (15,252)  
Weighted average exercise price, forfeited prior to vesting (in dollars per share) $ 11.01 $ 10.67 $ 7.85  
Number of shares, exercised (in shares) (178,662) (374,857) (56,143)  
Weighted average exercise price, exercised (in dollars per share) $ 5.90 $ 4.46 $ 5.51  
Number of shares, outstanding at end of period (in shares) 764,430 850,232 1,028,935 1,040,081
Weighted average exercise price, end of period (in dollars per share) $ 8.78 $ 8.06 $ 6.03 $ 5.65
Number of shares, vested and expected to vest (in shares) 764,430 850,232 1,028,935  
Weighted average exercise price, vested and expected to vest (in dollars per share) $ 8.78 $ 8.06 $ 6.03  
Weighted average remaining contractual term, vested and expected to vest (Year) 6 years 175 days 5 years 284 days 4 years 266 days  
Aggregate intrinsic value, vested and expected to vest $ 1,038 $ 3,001 $ 7,104  
Number of shares, vested at end of period (in shares) 529,669 552,097 820,022  
Weighted average exercise price, vested at end of period (in dollars per share) $ 7.89 $ 6.33 $ 5.10  
Weighted average remaining contractual term, vested (Year) 5 years 182 days 4 years 32 days 3 years 270 days  
Aggregate intrinsic value, vested $ 1,033 $ 2,843 $ 6,419