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Condensed 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, 2017 $ 222,224     $ 114,456 $ 107,768
Beginning balance, shares at Sep. 30, 2017   11,294,083 12,230,625    
Stock compensation expense 428     428  
Cumulative effect of change in accounting principle 665       665
Net income 22,624       22,624
Ending balance at Dec. 31, 2017 245,941     114,884 131,057
Ending balance, shares at Dec. 31, 2017   11,294,083 12,230,625    
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    
Repurchased shares and warrants   $ (500)      
Net income 13,861        
Ending balance at Jun. 30, 2018 232,623     112,732 119,891
Ending balance, shares at Jun. 30, 2018   12,572,630 10,871,730    
Beginning balance at Dec. 31, 2017 245,941     114,884 131,057
Beginning balance, shares at Dec. 31, 2017   11,294,083 12,230,625    
Stock compensation expense 391     391  
Warrants converted to common stock, shares   1,089,720 (1,089,720)    
Restricted shares issued, shares   10,412      
Net income 2,372       2,372
Ending balance at Mar. 31, 2018 248,704     115,275 133,429
Ending balance, shares at Mar. 31, 2018   12,394,215 11,140,905    
Stock compensation expense 390     390  
Repurchased shares and warrants (3,259)     (3,259)  
Repurchased shares and warrants, shares   (74,275) (250,000)    
Warrants converted to common stock, shares   19,175 (19,175)    
Restricted shares issued 326     326  
Restricted shares issued, shares   233,515      
Cumulative effect of change in accounting principle (2,403)       (2,403)
Net income (11,135)       (11,135)
Ending balance at Jun. 30, 2018 232,623     112,732 119,891
Ending balance, shares at Jun. 30, 2018   12,572,630 10,871,730    
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    
Repurchased shares and warrants   $ (1,500)      
Net income 35,337        
Ending balance at Jun. 30, 2019 412,734     237,613 175,121
Ending balance, shares at Jun. 30, 2019   30,361,168 4,603,333    
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, shares   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    
Stock compensation expense 1,507     1,507  
Repurchased shares and warrants (1,065)     (1,065)  
Repurchased shares and warrants, shares   (116,757)      
Warrants converted to common stock, shares   2,176,964 (2,176,964)    
Restricted shares issued, shares   331,486      
Net income 3,007       3,007
Ending balance at Jun. 30, 2019 $ 412,734     $ 237,613 $ 175,121
Ending balance, shares at Jun. 30, 2019   30,361,168 4,603,333