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Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Number of Warrants [Member] | Common Stock and Additional Paid-In Capital [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Beginning balance at Sep. 30, 2018 | $ 374,467 |  |  | $ 234,683 | $ 139,784
Beginning balance, shares at Sep. 30, 2018 |  | 23,902,903 | 10,614,990 |  |
Stock compensation expense | 1,454 |  |  | 1,454 |
Stock issuance costs | 157 |  |  | 157 |
Net income | 19,081 |  |  |  | 19,081
Ending balance at Dec. 31, 2018 | 395,159 |  |  | 236,294 | 158,865
Ending balance, shares at Dec. 31, 2018 |  | 23,902,903 | 10,614,990 |  |
Beginning balance at Sep. 30, 2019 | 425,868 |  |  | 238,504 | 187,364
Beginning balance, shares at Sep. 30, 2019 |  | 31,413,287 | 3,600,953 |  |
Adoption ASU 2018-09 Stock compensation-income taxes | ASU 2018-09 [Member] | 259 |  |  |  | 259
Stock compensation expense | 1,320 |  |  | 1,320 |
Repurchased shares and warrants | (41) | $ (40) |  | (41) |
Repurchased shares and warrants, shares |  | (5,558) |  |  |
Warrants converted to common stock |  | 1,612,481 | (1,612,481) |  |
Restricted shares issued, shares |  | 18,916 |  |  |
Net income | 10,785 |  |  |  | 10,785
Ending balance at Dec. 31, 2019 | $ 438,191 |  |  | $ 239,783 | $ 198,408
Ending balance, shares at Dec. 31, 2019 |  | 33,039,126 | 1,988,472 |  |

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