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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
Total
Director [Member]
Common stock
Common stock
Director [Member]
Additional Paid-in Capital
Additional Paid-in Capital
Director [Member]
Retained Earnings [Member]
Treasury Stock
Beginning balance, shares outstanding at Dec. 31, 2019     17,855,000          
Beginning Balance at Dec. 31, 2019 $ 226,569,000   $ 259,000   $ 242,147,000   $ 86,213,000 $ (102,050,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net Income (Loss) 7,725,000           7,725,000  
Isuuance of common stock, shares     60,000 26,000        
Issuance of common stock from employee stock purchase plan $ 921,000 $ 492,000 $ 1,000   920,000 $ 492,000    
Exercise of stock options, shares 17,913   12,000          
Exercise of stock options $ (31,000)   $ 0   (31,000)      
Issuance of restricted common stock, shares     10,000          
Issuance of restricted common stock 0              
Cancellation and retirement of restricted common stock, shares     (11,000)          
Cancellation and surrender of restricted common stock (250,000)       (250,000)      
Stock-based compensation expense 1,981,000       1,981,000      
Dividends on common stock (4,251,000)       (4,251,000)      
Adjustments to Additional Paid in Capital, Other (828,000)       (828,000)      
Other, shares     18,000          
Other 468,000   $ 468,000          
Ending balance, shares outstanding at Sep. 30, 2020     17,970,000          
Ending Balance at Sep. 30, 2020 232,796,000   $ 260,000   240,648,000   93,938,000 (102,050,000)
Beginning balance, shares outstanding at Jun. 30, 2020     17,934,000          
Beginning Balance at Jun. 30, 2020 228,491,000   $ 260,000   241,868,000   88,413,000 (102,050,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net Income (Loss) 5,525,000           5,525,000  
Isuuance of common stock, shares     16,000 9,000        
Issuance of common stock from employee stock purchase plan $ 297,000 198,000 $ 0   297,000 198,000    
Exercise of stock options, shares 17,913   12,000          
Exercise of stock options $ (31,000)   $ 0   (31,000)      
Cancellation and retirement of restricted common stock, shares     (1,000)          
Cancellation and surrender of restricted common stock (16,000)       (16,000)      
Stock-based compensation expense 729,000       729,000      
Dividends on common stock (1,569,000)       (1,569,000)      
Adjustments to Additional Paid in Capital, Other (828,000)       (828,000)      
Ending balance, shares outstanding at Sep. 30, 2020     17,970,000          
Ending Balance at Sep. 30, 2020 232,796,000   $ 260,000   240,648,000   93,938,000 (102,050,000)
Beginning balance, shares outstanding at Dec. 31, 2020     17,995,000          
Beginning Balance at Dec. 31, 2020 240,502,000   $ 260,000   239,989,000   102,303,000 (102,050,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net Income (Loss) 19,812,000           19,812,000  
Isuuance of common stock, shares     47,000 13,000        
Issuance of common stock from employee stock purchase plan $ 1,228,000 495,000 $ 1,000   1,227,000 495,000    
Exercise of stock options, shares 314,294   127,000          
Exercise of stock options $ (177,000)   $ 1,000   (178,000)      
Issuance of restricted common stock, shares     9,000          
Issuance of restricted common stock 0              
Cancellation and retirement of restricted common stock, shares     (11,000)          
Cancellation and surrender of restricted common stock (375,000)       (375,000)      
Stock-based compensation expense 3,337,000       3,337,000      
Dividends on common stock (5,390,000)       (5,390,000)      
Adjustments to Additional Paid in Capital, Other (1,424,000)       (1,424,000)      
Treasury stock acquired $ (65,540,000)             (65,540,000)
Treasury Stock, Shares, Acquired 1,528,197   1,528,000          
Ending balance, shares outstanding at Sep. 30, 2021     16,652,000          
Ending Balance at Sep. 30, 2021 $ 192,468,000   $ 262,000   237,681,000   122,115,000 (167,590,000)
Beginning balance, shares outstanding at Jun. 30, 2021     17,826,000          
Beginning Balance at Jun. 30, 2021 232,871,000       237,891,000   109,069,000 (114,351,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net Income (Loss) 13,046,000           13,046,000  
Isuuance of common stock, shares     15,000 3,000        
Issuance of common stock from employee stock purchase plan $ 388,000 $ 147,000     388,000 $ 147,000    
Exercise of stock options, shares 32,665   12,000          
Exercise of stock options $ (82,000)       (82,000)      
Cancellation and retirement of restricted common stock, shares     (1,000)          
Cancellation and surrender of restricted common stock (28,000)       (28,000)      
Stock-based compensation expense 1,148,000       1,148,000      
Dividends on common stock (1,783,000)       (1,783,000)      
Treasury stock acquired $ (53,239,000)             (53,239,000)
Treasury Stock, Shares, Acquired 1,203,493   1,203,000          
Ending balance, shares outstanding at Sep. 30, 2021     16,652,000          
Ending Balance at Sep. 30, 2021 $ 192,468,000   $ 262,000   $ 237,681,000   $ 122,115,000 $ (167,590,000)