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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 $ 27,301,000           27,301,000  
Issuance of common stock from employee stock purchase plan, shares 25,089   25,000          
Issuance of common stock from employee stock purchase plan $ 1,001,000   $ 0   1,001,000      
Isuuance of common stock, shares       5,000        
Issuance of common stock   $ 246,000       $ 246,000    
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 (205,000)       (205,000)      
Stock-based compensation expense 2,839,000       2,839,000      
Dividends on common stock $ (3,455,000)       (3,455,000)      
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 Jun. 30, 2022     14,698,000          
Ending Balance at Jun. 30, 2022 122,844,000   $ 263,000   238,571,000   162,763,000 (278,753,000)
Beginning balance, shares outstanding at Mar. 31, 2022     14,889,000          
Beginning Balance at Mar. 31, 2022 120,021,000   $ 263,000   238,423,000   151,864,000 (270,529,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 10,899,000           10,899,000  
Issuance of common stock from employee stock purchase plan, shares 11,796              
Isuuance of common stock, shares     12,000 2,000        
Issuance of common stock $ 398,000 99,000     398,000 99,000    
Exercise of stock options, shares 0              
Cancellation and retirement of restricted common stock, shares     0          
Cancellation and surrender of common and restricted stock $ 2,000       2,000      
Stock-based compensation expense 1,379,000       1,379,000      
Dividends on common stock $ (1,730,000)       (1,730,000)      
Treasury stock acquired, shares (205,496)   (205,000)          
Treasury stock acquired $ (8,224,000)             (8,224,000)
Ending balance, shares outstanding at Jun. 30, 2022     14,698,000          
Ending Balance at Jun. 30, 2022 122,844,000   $ 263,000   238,571,000   162,763,000 (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 $ 17,130,000           17,130,000  
Issuance of common stock from employee stock purchase plan, shares 38,042   38,000          
Issuance of common stock from employee stock purchase plan $ 923,000       923,000      
Isuuance of common stock, shares       6,000        
Issuance of common stock, shares     30,000          
Issuance of common stock $ 826,000 177,000     826,000 177,000    
Issuance of restricted common stock, shares     142,000          
Issuance of restricted common stock     $ 2,000   (2,000)      
Exercise of stock options, shares 29,300   5,000          
Exercise of stock options $ (41,000)       (41,000)      
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 3,160,000       3,160,000      
Dividends on common stock $ (3,340,000)       (3,340,000)      
Treasury stock acquired, shares 0              
Treasury stock acquired $ 0              
Other, shares     8,000          
Other 276,000       276,000      
Ending balance, shares outstanding at Jun. 30, 2023     14,958,000          
Ending Balance at Jun. 30, 2023 156,167,000   $ 266,000   240,681,000   193,973,000 (278,753,000)
Beginning balance, shares outstanding at Mar. 31, 2023     14,935,000          
Beginning Balance at Mar. 31, 2023 147,162,000   $ 266,000   239,962,000   185,687,000 (278,753,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 8,286,000           8,286,000  
Issuance of common stock from employee stock purchase plan, shares 16,386              
Isuuance of common stock, shares     16,000 2,000        
Issuance of common stock $ 397,000 $ 65,000     397,000 $ 65,000    
Exercise of stock options, shares 17,300   4,000          
Exercise of stock options $ (20,000)       (20,000)      
Cancellation and retirement of restricted common stock, shares     1,000          
Cancellation and surrender of common and restricted stock (1,000)       (1,000)      
Stock-based compensation expense 1,957,000       1,957,000      
Dividends on common stock $ (1,679,000)       (1,679,000)      
Treasury stock acquired, shares 0              
Treasury stock acquired $ 0              
Ending balance, shares outstanding at Jun. 30, 2023     14,958,000          
Ending Balance at Jun. 30, 2023 $ 156,167,000   $ 266,000   $ 240,681,000   $ 193,973,000 $ (278,753,000)