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Consolidated Statement of Stockholders' Equity - USD ($)
$ in Thousands
Total
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]
Revision of Prior Period Accounting Standards Update Adjustment [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 5,508       5,508    
Stock issuance costs 185       185    
Repurchased shares (1,872)   $ (1,900)   (1,872)    
Repurchased shares, 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 (ASU 2018-09 [Member]) at Sep. 30, 2019   $ 259         $ 259
Ending balance, shares at Sep. 30, 2019     31,413,287 3,600,953      
Stock compensation expense 4,414       4,414    
Repurchased shares (586)   $ (600)   (586)    
Repurchased shares, 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        
Net income 27,464         27,464  
Ending balance at Sep. 30, 2020 457,859       242,772 215,087  
Ending balance, shares at Sep. 30, 2020     35,526,918        
Stock compensation expense 3,126       3,126    
Repurchased shares (1,486)   $ (1,500)   (1,486)    
Repurchased shares, shares     (155,174)        
Issuance of warrants, net of issuance costs 11,489       11,489    
Issuance of warrants, net of issuance costs, shares       4,899,497      
Restricted shares issued, shares     492,465        
Employee share purchases 471       471    
Employee share purchases, shares     94,550        
Net income 16,588         16,588  
Ending balance at Sep. 30, 2021 $ 488,047       $ 256,372 $ 231,675  
Ending balance, shares at Sep. 30, 2021     35,958,759 4,899,497