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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]
Prior period adjustment $ 2,252       $ 2,252
Balance as corrected at Sep 30, 2015 174,096     $ 114,076 60,020
Balance as corrected, shares at Sep 30, 2015   7,866,160 16,165,628    
Beginning balance at Sep. 30, 2015 171,844     114,076 57,768
Beginning balances, shares at Sep. 30, 2015   7,866,160 16,165,628    
Stock compensation expense 1,546     1,546  
Repurchased shares and warrants (1,411)     (1,411)  
Repurchased shares and warrants, shares   (232,085)      
Forfeited warrants     (804,700)    
Warrants converted to common stock   2,210,318 (2,210,318)    
Restricted shares issued, shares   525,250      
Net income 14,920       14,920
Ending balance at Sep. 30, 2016 189,151     114,211 74,940
Ending 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)     (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