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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, 2018 374,467     234,683 139,784
Beginning balance, shares at Sep. 30, 2018   23,902,903 10,614,990    
Net income 32,330        
Ending balance at Mar. 31, 2019 409,285     237,171 172,114
Ending balance, shares at Mar. 31, 2019   27,969,475 6,780,297    
Beginning balance at Dec. 31, 2018 395,159     236,294 158,865
Beginning balance, shares at Dec. 31, 2018   23,902,903 10,614,990    
Stock compensation expense 1,298     1,298  
Repurchased shares and warrants (449)     (449)  
Repurchased shares and warrants, shares   (52,967)      
Stock issuance costs 28     28  
Warrants converted to common stock   3,834,693 (3,834,693)    
Restricted shares issued, shares   284,846      
Net income 13,249       13,249
Ending balance at Mar. 31, 2019 409,285     237,171 172,114
Ending balance, shares at Mar. 31, 2019   27,969,475 6,780,297    
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)     (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    
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    
Repurchased shares and warrants   $ (40)      
Net income 12,670        
Ending balance at Mar. 31, 2020 441,352     241,059 200,293
Ending balance, shares at Mar. 31, 2020   35,194,902      
Beginning balance at Dec. 31, 2019 438,191     239,783 198,408
Beginning balance, shares at Dec. 31, 2019   33,039,126 1,988,472    
Stock compensation expense 1,193     1,193  
Repurchased shares and warrants (160)     (160)  
Repurchased shares and warrants, shares   (18,244)      
Warrants converted to common stock   1,988,472 (1,988,472)    
Restricted shares issued, shares   141,614      
Employee share purchases 243     243  
Employee share purchases, shares   43,934      
Net income 1,885       1,885
Ending balance at Mar. 31, 2020 $ 441,352     $ 241,059 $ 200,293
Ending balance, shares at Mar. 31, 2020   35,194,902