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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 $ 33,161,000           33,161,000  
Issuance of common stock from employee stock purchase plan, shares 38,884   39,000          
Issuance of common stock from employee stock purchase plan $ 1,378,000   $ 0   1,378,000      
Isuuance of common stock, shares       7,000        
Issuance of common stock   $ 322,000       $ 322,000    
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     (6,000)          
Cancellation and surrender of common and restricted stock (205,000)       (205,000)      
Stock-based compensation expense 4,255,000       4,255,000      
Dividends on common stock $ (5,108,000)       (5,108,000)      
Treasury stock acquired, shares (695,496)   (695,000)          
Treasury stock acquired $ (34,234,000)             (34,234,000)
Other, shares     27,000          
Other 1,358,000       1,358,000      
Ending balance, shares outstanding at Sep. 30, 2022     14,713,000          
Ending Balance at Sep. 30, 2022 128,920,000   $ 263,000   238,787,000   168,623,000 (278,753,000)
Beginning balance, shares outstanding at Jun. 30, 2022     14,698,000          
Beginning Balance at Jun. 30, 2022 122,844,000   $ 263,000   238,571,000   162,763,000 (278,753,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 5,860,000           5,860,000  
Issuance of common stock from employee stock purchase plan, shares 13,795              
Isuuance of common stock, shares     14,000 2,000        
Issuance of common stock $ 377,000 76,000     377,000 76,000    
Exercise of stock options, shares 0              
Cancellation and retirement of restricted common stock, shares     (1,000)          
Cancellation and surrender of common and restricted stock $ 0       0      
Stock-based compensation expense 1,416,000       1,416,000      
Dividends on common stock $ (1,653,000)       (1,653,000)      
Treasury stock acquired, shares 0              
Treasury stock acquired $ 0              
Ending balance, shares outstanding at Sep. 30, 2022     14,713,000          
Ending Balance at Sep. 30, 2022 128,920,000   $ 263,000   238,787,000   168,623,000 (278,753,000)
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 $ 21,775,000           21,775,000  
Issuance of common stock from employee stock purchase plan, shares 49,824   50,000          
Issuance of common stock from employee stock purchase plan $ 1,207,000       1,207,000      
Isuuance of common stock, shares       11,000        
Issuance of common stock, shares     30,000          
Issuance of common stock $ 826,000 338,000     826,000 338,000    
Issuance of restricted common stock, shares     142,000          
Issuance of restricted common stock     $ 2,000   (2,000)      
Exercise of stock options, shares 74,200   12,000          
Exercise of stock options $ (174,000)       (174,000)      
Cancellation and retirement of restricted common stock, shares     (3,000)          
Cancellation and surrender of common and restricted stock (78,000)       (78,000)      
Stock-based compensation expense 4,991,000       4,991,000      
Dividends on common stock $ (5,023,000)       (5,023,000)      
Treasury stock acquired, shares 0              
Treasury stock acquired $ 0              
Other, shares     8,000          
Other 276,000       276,000      
Ending balance, shares outstanding at Sep. 30, 2023     14,982,000          
Ending Balance at Sep. 30, 2023 161,272,000   $ 266,000   241,141,000   198,618,000 (278,753,000)
Beginning balance, shares outstanding at Jun. 30, 2023     14,958,000          
Beginning Balance at Jun. 30, 2023 156,167,000   $ 266,000   240,681,000   193,973,000 (278,753,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 4,645,000           4,645,000  
Issuance of common stock from employee stock purchase plan, shares 11,782              
Isuuance of common stock, shares     12,000 5,000        
Issuance of common stock $ 284,000 $ 161,000     284,000 $ 161,000    
Exercise of stock options, shares 44,900   7,000          
Exercise of stock options $ (133,000)       (133,000)      
Stock-based compensation expense 1,831,000       1,831,000      
Dividends on common stock $ (1,683,000)       (1,683,000)      
Treasury stock acquired, shares 0              
Treasury stock acquired $ 0              
Ending balance, shares outstanding at Sep. 30, 2023     14,982,000          
Ending Balance at Sep. 30, 2023 $ 161,272,000   $ 266,000   $ 241,141,000   $ 198,618,000 $ (278,753,000)