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Note 9 - Stockholders' Equity - Options Classified Into Range of Exercise Price (Details) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Outstanding, number of options and SARs (in shares) [2] 126,000 [1] 289,069
Outstanding, Weighted average remaining contractual term (Year) 2 years 7 months 6 days [1] 3 years 7 months 6 days
Outstanding, weighted average exercise price (in dollars per share) $ 20.06  
Exercisable, Number of shares (in shares) [2],[3] 126,000  
Exercisable, weighted average remaining contractual life (Year) 2 years 7 months 6 days  
Exercisable, Weighted average exercise price (in dollars per share) [3] $ 20.06  
Exercise Price Range 1 [Member]    
Range of exercise price, lower limit (in dollars per share) 14.77  
Range of exercise price, upper limit (in dollars per share) $ 17.61  
Outstanding, number of options and SARs (in shares) 39,000  
Outstanding, Weighted average remaining contractual term (Year) 1 year 9 months 18 days  
Outstanding, weighted average exercise price (in dollars per share) $ 15.72  
Exercisable, Number of shares (in shares) 39,000  
Exercisable, weighted average remaining contractual life (Year) 1 year 9 months 18 days  
Exercisable, Weighted average exercise price (in dollars per share) $ 15.72  
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) $ 19.59  
Outstanding, number of options and SARs (in shares) 57,000  
Outstanding, Weighted average remaining contractual term (Year) 2 years 4 months 24 days  
Outstanding, weighted average exercise price (in dollars per share) $ 19.41  
Exercisable, Number of shares (in shares) 57,000  
Exercisable, weighted average remaining contractual life (Year) 2 years 4 months 24 days  
Exercisable, Weighted average exercise price (in dollars per share) $ 19.41  
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) $ 27.17  
Outstanding, number of options and SARs (in shares) 30,000  
Outstanding, Weighted average remaining contractual term (Year) 4 years 1 month 6 days  
Outstanding, weighted average exercise price (in dollars per share) $ 26.94  
Exercisable, Number of shares (in shares) 30,000  
Exercisable, weighted average remaining contractual life (Year) 4 years 1 month 6 days  
Exercisable, Weighted average exercise price (in dollars per share) $ 26.94  
[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 280,427 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 280,427 shares of the Company's common stock issuable upon exercise.