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STOCK COMPENSATION - Summary of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Number of Shares      
Options outstanding, beginning of period (in shares) 59,835 155,961  
Granted (in shares) 0 0 0
Exercised (in shares) (59,835) (93,099)  
Forfeited or expired (in shares) 0 (3,027)  
Options outstanding, end of period (in shares) 0 59,835 155,961
Options exercisable end of year (in shares) 0 59,835  
Weighted Average Exercise Price      
Options outstanding, beginning of period (in dollars per share) $ 8.06 $ 8.48  
Granted (in dollars per share) 0 0  
Exercised (in dollars per share) 8.06 8.68  
Forfeited or expired (in dollars per share) 0 10.60  
Options outstanding, end of period (in dollars per share) 0 8.06 $ 8.48
Options exercisable end of year (in dollars per share) $ 0 $ 8.06  
Weighted Average Remaining Contractual Term (Yrs)      
Options outstanding , weighted average remaining contractual term (in years) 0 years 1 year 6 months 14 days 1 year 9 months 10 days
Options exercised, weighted average remaining contractual term (in years) 1 year    
Options exercisable end of year, weighted average remaining contractual term (in years) 0 years 1 year 6 months 14 days  
Aggregate Intrinsic Value      
Options outstanding, beginning of period $ 1,469 $ 2,974  
Granted 0 0  
Exercised 1,011 1,842 $ 1,900
Forfeited or expired 0 33  
Options outstanding, end of period $ 0 1,469 $ 2,974
Options exercisable end of fiscal year   $ 1,469