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STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY - USD ($) $ in Thousands | Common Stock | Treasury stock | Additional paid-in-capital | Retained earnings | Total
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2018 | $ 24 |  | $ 167,743 | $ 21,513 | $ 189,280
Beginning Balance (in shares) at Dec. 31, 2018 | 24,000,000 |  |  |  |
Sale of over-allotment common stock in initial public offering, net of offering costs | $ 1 |  | 6,694 |  | 6,695
Sale of over-allotment common stock in initial public offering, net of offering costs (in shares) | 600,000 |  |  |  |
Share based compensation expense and stock units vested |  |  | 630 |  | 630
Share based compensation expense and stock units vested (in shares) | 20,079 |  |  |  |
Purchase of treasury stock |  | $ (3,060) |  |  | (3,060)
Net income |  |  |  | 28,844 | 28,844
Ending Balance at Dec. 31, 2019 | $ 25 | (3,060) | 175,067 | 50,357 | $ 222,389
Ending Balance (in shares) at Dec. 31, 2019 | 24,620,079 |  |  |  | 24,620,079
Share based compensation expense and stock units vested |  |  | 226 |  | $ 226
Share based compensation expense and stock units vested (in shares) | 19,046 |  |  |  |
Purchase of treasury stock |  | (1,417) |  |  | (1,417)
Net income |  |  |  | 37,995 | 37,995
Ending Balance at Dec. 31, 2020 | $ 25 | $ (4,477) | $ 175,293 | $ 88,352 | $ 259,193
Ending Balance (in shares) at Dec. 31, 2020 | 24,639,125 |  |  |  | 24,639,125

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