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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands | Total | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Class A Common Stock Common Stock | Class B Common Stock | Class B Common Stock Common Stock
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Sep. 30, 2018 |  |  |  |  | 11,950,000,000 |  | 42,387,571,000
Beginning balance at Sep. 30, 2018 | $ 299,469 | $ 242,493 | $ (15,603) | $ 72,525 | $ 12 |  | $ 42
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 5,154 |  |  | 5,154 |  |  |
Ending balance (in shares) at Dec. 31, 2018 |  |  |  |  | 11,950,000,000 |  | 42,387,571,000
Ending balance at Dec. 31, 2018 | 304,623 | 242,493 | (15,603) | 77,679 | $ 12 |  | $ 42
Beginning balance (in shares) at Sep. 30, 2018 |  |  |  |  | 11,950,000,000 |  | 42,387,571,000
Beginning balance at Sep. 30, 2018 | 299,469 | 242,493 | (15,603) | 72,525 | $ 12 |  | $ 42
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 9,366 |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2019 |  |  |  |  | 11,950,000,000 |  | 42,387,571,000
Ending balance at Mar. 31, 2019 | 308,835 | 242,493 | (15,603) | 81,891 | $ 12 |  | $ 42
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  |  | 11,950,000,000 |  | 42,387,571,000
Beginning balance at Dec. 31, 2018 | 304,623 | 242,493 | (15,603) | 77,679 | $ 12 |  | $ 42
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 4,212 |  |  | 4,212 |  |  |
Ending balance (in shares) at Mar. 31, 2019 |  |  |  |  | 11,950,000,000 |  | 42,387,571,000
Ending balance at Mar. 31, 2019 | 308,835 | 242,493 | (15,603) | 81,891 | $ 12 |  | $ 42
Beginning balance (in shares) at Sep. 30, 2019 |  |  |  |  | 32,597,736 |  | 22,106,961
Beginning balance at Sep. 30, 2019 | 343,550 | 243,452 | (15,603) | 115,646 | $ 33 |  | $ 22
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 5,461 |  |  | 5,461 |  |  |
Equity-based compensation expense | 395 | 395 |  |  |  |  |
Conversion of Class B common stock to Class A common stock (in shares) |  |  |  |  | 107,682 |  | (107,682)
Ending balance (in shares) at Dec. 31, 2019 |  |  |  |  | 32,705,418 |  | 21,999,279
Ending balance at Dec. 31, 2019 | 349,184 | 243,847 | (15,603) | 120,885 | $ 33 |  | $ 22
Beginning balance (in shares) at Sep. 30, 2019 |  |  |  |  | 32,597,736 |  | 22,106,961
Beginning balance at Sep. 30, 2019 | 343,550 | 243,452 | (15,603) | 115,646 | $ 33 |  | $ 22
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 6,998 |  |  |  |  |  |
Conversion of Class B common stock to Class A common stock (in shares) |  |  |  |  |  | 107,682 |
Ending balance (in shares) at Mar. 31, 2020 |  |  |  |  | 32,705,418 |  | 21,999,279
Ending balance at Mar. 31, 2020 | 351,111 | 244,237 | (15,603) | 122,422 | $ 33 |  | $ 22
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  |  | 32,705,418 |  | 21,999,279
Beginning balance at Dec. 31, 2019 | 349,184 | 243,847 | (15,603) | 120,885 | $ 33 |  | $ 22
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 1,537 |  |  | 1,537 |  |  |
Equity-based compensation expense | 390 | 390 |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2020 |  |  |  |  | 32,705,418 |  | 21,999,279
Ending balance at Mar. 31, 2020 | $ 351,111 | $ 244,237 | $ (15,603) | $ 122,422 | $ 33 |  | $ 22

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