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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
Total
Director
Common stock
Common stock
Director
Additional Paid-in Capital
Additional Paid-in Capital
Director
Retained Earnings
Treasury Stock
Beginning balance, shares outstanding at Dec. 31, 2021     15,332,000          
Beginning Balance at Dec. 31, 2021 $ 128,015,000   $ 263,000   $ 236,809,000   $ 135,462,000 $ (244,519,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 16,402,000           16,402,000  
Issuance of common stock from employee stock purchase plan, shares 13,293   13,000          
Issuance of common stock from employee stock purchase plan $ 603,000   $ 0   603,000      
Isuuance of common stock, shares       3,000        
Issuance of common stock   $ 147,000       $ 147,000    
Exercise of stock options, shares 18,736   9,000          
Exercise of stock options $ (22,000)       (22,000)      
Cancellation and retirement of restricted common stock, shares     (5,000)          
Cancellation and surrender of common and restricted stock (207,000)       (207,000)      
Stock-based compensation expense 1,460,000       1,460,000      
Dividends on common stock $ (1,725,000)       (1,725,000)      
Treasury stock acquired, shares (490,000)   (490,000)          
Treasury stock acquired $ (26,010,000)             (26,010,000)
Other, shares     27,000          
Other 1,358,000       1,358,000      
Ending balance, shares outstanding at Mar. 31, 2022     14,889,000          
Ending Balance at Mar. 31, 2022 120,021,000   $ 263,000   238,423,000   151,864,000 (270,529,000)
Beginning balance, shares outstanding at Dec. 31, 2022     14,732,000          
Beginning Balance at Dec. 31, 2022 137,134,000   $ 264,000   238,780,000   176,843,000 (278,753,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 8,844,000           8,844,000  
Issuance of common stock from employee stock purchase plan, shares 21,656   22,000          
Issuance of common stock from employee stock purchase plan $ 526,000       526,000      
Isuuance of common stock, shares       4,000        
Issuance of common stock, shares     30,000          
Issuance of common stock $ 826,000 $ 112,000     826,000 $ 112,000    
Issuance of restricted common stock, shares     142,000          
Issuance of restricted common stock     $ 2,000   (2,000)      
Exercise of stock options, shares 12,000   1,000          
Exercise of stock options $ (21,000)       (21,000)      
Cancellation and retirement of restricted common stock, shares     (4,000)          
Cancellation and surrender of common and restricted stock (77,000)       (77,000)      
Stock-based compensation expense 1,203,000       1,203,000      
Dividends on common stock $ (1,661,000)       (1,661,000)      
Treasury stock acquired, shares 0              
Treasury stock acquired $ 0              
Other, shares     8,000          
Other 276,000       276,000      
Ending balance, shares outstanding at Mar. 31, 2023     14,935,000          
Ending Balance at Mar. 31, 2023 $ 147,162,000   $ 266,000   $ 239,962,000   $ 185,687,000 $ (278,753,000)