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Stock Options (Details) - USD ($)
 3 Months Ended
May 02, 2022
Apr. 18, 2022
Mar. 31, 2022
Mar. 31, 2021
Apr. 05, 2012
Employee Stock Options | 2012 Plan          
Stock option details          
Shares available for future grants     5,628   800,000
Maximum exercisable period for granted share-based compensation     10 years    
Number of options granted (in shares)     31,150    
Stock option activity          
Options outstanding at the beginning of the period (in shares)     520,551    
Plus: Options granted (in shares)     31,150    
Less:          
Exercise of stock options (in shares)     6,337    
Options forfeited (in shares)     6,100    
Options outstanding at the end of the period (in shares)     539,264    
Options fully vested and exercisable at the end of the period (in shares)     286,828    
Stock Options, Weighted average exercise price          
Options outstanding at the beginning, weighted average exercise price (in dollars per share)     $ 28.28    
Plus: Options granted, weighted average exercise price (in dollars per share)     38.92    
Less:          
Options exercised, weighted average exercise price (in dollars per share)     23.22    
Options forfeited, weighted average exercise price (in dollars per share)     32.90    
Options outstanding at the end, weighted average exercise price (in dollars per share)     28.90    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share)     $ 23.29    
Stock Options, Weighted average remaining contractual term (years)          
Options outstanding at the end, weighted average remaining contractual term (years)     4 years 6 months 21 days    
Options fully vested and exercisable at the end, weighted average remaining contractual term (years)     2 years 5 months 26 days    
Stock Options, Aggregate intrinsic value          
Options outstanding at the end, aggregate intrinsic value     $ 7,175,000    
Options fully vested and exercisable at the end, aggregate intrinsic value     5,428,000    
Stock-based compensation expense     121,000 $ 159,000  
Stock-based compensation cost, unrecognized, related to non-vested options     $ 1,089,000    
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition     2 years    
Stock Appreciation Rights | SAR Plan          
Stock option details          
Shares available for future grants   750,000      
Maximum exercisable period for granted share-based compensation   10 years      
Number of rights issued 0        
Incentive Stock Options to 10 Percent Shareholders [Member] | 2012 Plan          
Stock option details          
Maximum exercisable period for granted share-based compensation     5 years