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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, 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