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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)

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