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CONDENSED 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, 2019 $ 25 $ (3,060) $ 175,067 $ 50,357 $ 222,389
Beginning Balance (in shares) at Dec. 31, 2019 24,620,079        
Share based compensation expense and stock units vested     97   97
Share based compensation expense and stock units vested (in shares) 17,143        
Purchase of treasury stock   (682)     (682)
Net income       9,023 9,023
Ending Balance at Mar. 31, 2020 $ 25 (3,742) 175,164 59,380 230,827
Ending Balance (in shares) at Mar. 31, 2020 24,637,222        
Beginning Balance at Dec. 31, 2019 $ 25 (3,060) 175,067 50,357 222,389
Beginning Balance (in shares) at Dec. 31, 2019 24,620,079        
Net income         27,507
Ending Balance at Sep. 30, 2020 $ 25 (4,477) 175,244 77,866 248,658
Ending Balance (in shares) at Sep. 30, 2020 24,637,222        
Beginning Balance at Mar. 31, 2020 $ 25 (3,742) 175,164 59,380 230,827
Beginning Balance (in shares) at Mar. 31, 2020 24,637,222        
Share based compensation expense and stock units vested     36   36
Purchase of treasury stock   (735)     (735)
Net income       10,040 10,040
Ending Balance at Jun. 30, 2020 $ 25 (4,477) 175,200 69,420 240,168
Ending Balance (in shares) at Jun. 30, 2020 24,637,222        
Share based compensation expense and stock units vested     44   44
Net income       8,446 8,446
Ending Balance at Sep. 30, 2020 $ 25 (4,477) 175,244 77,866 248,658
Ending Balance (in shares) at Sep. 30, 2020 24,637,222        
Beginning Balance at Dec. 31, 2020 $ 25 (4,477) 175,293 88,352 $ 259,193
Beginning Balance (in shares) at Dec. 31, 2020 24,639,125       24,639,125
Share based compensation expense and stock units vested     44   $ 44
Share based compensation expense and stock units vested (in shares) 8,571        
Net income       9,023 9,023
Ending Balance at Mar. 31, 2021 $ 25 (4,477) 175,337 97,375 268,260
Ending Balance (in shares) at Mar. 31, 2021 24,647,696        
Beginning Balance at Dec. 31, 2020 $ 25 (4,477) 175,293 88,352 $ 259,193
Beginning Balance (in shares) at Dec. 31, 2020 24,639,125       24,639,125
Net income         $ 36,183
Ending Balance at Sep. 30, 2021 $ 25 (4,477) 175,556 124,536 $ 295,640
Ending Balance (in shares) at Sep. 30, 2021 24,654,621       24,654,621
Beginning Balance at Mar. 31, 2021 $ 25 (4,477) 175,337 97,375 $ 268,260
Beginning Balance (in shares) at Mar. 31, 2021 24,647,696        
Share based compensation expense and stock units vested     64   64
Net income       12,428 12,428
Ending Balance at Jun. 30, 2021 $ 25 (4,477) 175,401 109,803 280,752
Ending Balance (in shares) at Jun. 30, 2021 24,647,696        
Share based compensation expense and stock units vested     55   55
Share based compensation expense - stock options exercised     100   100
Share based compensation expense - stock options exercised (Shares) 6,925        
Net income       14,733 14,733
Ending Balance at Sep. 30, 2021 $ 25 $ (4,477) $ 175,556 $ 124,536 $ 295,640
Ending Balance (in shares) at Sep. 30, 2021 24,654,621       24,654,621