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Consolidated Statement of Stockholders Equity - USD ($)
$ in Thousands
Total
Cumulative Effect of Change in Accounting Principle [Member]
Revision of Prior Period Accounting Standards Update Adjustment [Member]
Common Stock [Member]
Number of Warrants [Member]
Common Stock and Additional Paid-In Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect of Change in Accounting Principle [Member]
Retained Earnings [Member]
Revision of Prior Period Accounting Standards Update Adjustment [Member]
Beginning balance at Sep. 30, 2017 $ 222,224         $ 114,456 $ 107,768    
Beginning 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        
Ending balance at Sep. 30, 2018 374,467 $ (1,239)       234,683 139,784 $ (1,239)  
Net income 33,255           33,255    
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          
Ending balance at Sep. 30, 2019 425,868         238,504 187,364    
Net income 47,580           47,580    
Ending balance, shares at Sep. 30, 2019       31,413,287 3,600,953        
Stock compensation expense 4,414         4,414      
Repurchased shares and warrants (586)     $ (600)   (586)      
Repurchased shares and warrants, shares       (142,439)          
Warrants converted to common stock       3,600,953 (3,600,953)        
Restricted shares issued, shares       555,473          
Employee share purchases 440         440      
Employee share purchases, shares       99,644          
Ending balance at Sep. 30, 2020 457,859         $ 242,772 215,087    
Ending balance (ASU 2018-09 [Member]) at Sep. 30, 2020     $ 259           $ 259
Net income $ 27,464           $ 27,464    
Ending balance, shares at Sep. 30, 2020       35,526,918