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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