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Note 8 - Stockholders' Equity - Options Classified Into Range of Exercise Price (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Outstanding, number of options and SARs (in shares) [2] 702,817 [1] 729,017
Outstanding, Weighted average remaining contractual term (Year) 4 years 109 days [1] 5 years 73 days
Outstanding, weighted average exercise price (in dollars per share) $ 19.88  
Exercisable, Number of shares (in shares) [2],[3] 623,718  
Exercisable, weighted average remaining contractual life (Year) 4 years  
Exercisable, Weighted average exercise price (in dollars per share) [3] $ 19.14  
Exercise Price Range 1 [Member]    
Range of exercise price, lower limit (in dollars per share) 14.16  
Range of exercise price, upper limit (in dollars per share) $ 18.62  
Outstanding, number of options and SARs (in shares) 346,863  
Outstanding, Weighted average remaining contractual term (Year) 3 years 73 days  
Outstanding, weighted average exercise price (in dollars per share) $ 15.68  
Exercisable, Number of shares (in shares) 344,527  
Exercisable, weighted average remaining contractual life (Year) 3 years 73 days  
Exercisable, Weighted average exercise price (in dollars per share) $ 15.66  
Exercise Price Range 2 [Member]    
Range of exercise price, lower limit (in dollars per share) 19.36  
Range of exercise price, upper limit (in dollars per share) $ 19.83  
Outstanding, number of options and SARs (in shares) 182,995  
Outstanding, Weighted average remaining contractual term (Year) 5 years  
Outstanding, weighted average exercise price (in dollars per share) $ 19.44  
Exercisable, Number of shares (in shares) 163,050  
Exercisable, weighted average remaining contractual life (Year) 4 years 328 days  
Exercisable, Weighted average exercise price (in dollars per share) $ 19.43  
Exercise Price Range 3 [Member]    
Range of exercise price, lower limit (in dollars per share) 24.86  
Range of exercise price, upper limit (in dollars per share) $ 30.60  
Outstanding, number of options and SARs (in shares) 172,959  
Outstanding, Weighted average remaining contractual term (Year) 5 years 255 days  
Outstanding, weighted average exercise price (in dollars per share) $ 28.75  
Exercisable, Number of shares (in shares) 116,141  
Exercisable, weighted average remaining contractual life (Year) 4 years 328 days  
Exercisable, Weighted average exercise price (in dollars per share) $ 29.06  
[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 642,300 shares of the Company's common stock issuable upon exercise.
[2] The SAR units are convertible for a maximum number of shares of the Company's common stock equal to 75% of the SAR units subject to the grant.
[3] Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 565,851 shares of the Company's common stock issuable upon exercise.