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Consolidated Statement 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, 2016 $ 189,151     $ 114,211 $ 74,940
Beginning balance, shares at Sep. 30, 2016   10,369,643 13,150,610    
Stock compensation expense 1,288     1,288  
Repurchased shares and warrants (1,043)     (1,043)  
Repurchased shares and warrants, shares   (228,735)      
Warrants converted to common stock   919,985 (919,985)    
Restricted shares issued, shares   233,190      
Net income 32,828       32,828
Ending balance at Sep. 30, 2017 222,224     114,456 107,768
Ending balance, shares at Sep. 30, 2017   11,294,083 12,230,625    
Stock compensation expense 1,991     1,991  
Repurchased shares and warrants (7,709) $ (5,000)   (7,709)  
Repurchased shares and warrants, shares   (438,541) (250,000)    
Warrants converted to common stock   1,365,643 (1,365,643)    
Restricted shares issued 11,918     11,918  
Restricted shares issued, shares   1,327,700      
Conversion of unvested restricted shares 2,321     2,321  
IPO issuance 111,706     111,706  
IPO issuance, shares   10,354,018 8    
Cumulative effect of change in accounting principle (1,239)       (1,239)
Net income 33,255       33,255
Ending balance at Sep. 30, 2018 374,467     234,683 139,784
Ending balance, shares at Sep. 30, 2018   23,902,903 10,614,990    
Stock compensation expense 5,508     5,508  
Stock issuance costs 185     185  
Repurchased shares and warrants (1,872) $ (1,900)   (1,872)  
Repurchased shares and warrants, shares   (205,235)      
Warrants converted to common stock   7,014,037 (7,014,037)    
Restricted shares issued, shares   701,582      
Net income 47,580       47,580
Ending balance at Sep. 30, 2019 $ 425,868     $ 238,504 $ 187,364
Ending balance, shares at Sep. 30, 2019   31,413,287 3,600,953