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STOCK COMPENSATION - Summary of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Number of Shares [Roll Forward]      
Options outstanding, beginning of period (in shares) 155,961 227,271  
Granted (in shares) 0 0  
Exercised (in shares) (93,099) (71,310)  
Forfeited or expired (in shares) (3,027) 0  
Options outstanding, end of period (in shares) 59,835 155,961 227,271
Options exercisable end of year (in shares) 59,835 155,961  
Weighted Average Exercise Price [Roll Forward]      
Options outstanding, beginning of period (in dollars per share) $ 8.48 $ 7.54  
Granted (in dollars per share) 0 0  
Exercised (in dollars per share) 8.68 5.48  
Forfeited or expired (in dollars per share) 10.60 0  
Options outstanding, end of period (in dollars per share) 8.06 8.48 $ 7.54
Options exercisable end of year (in dollars per share) $ 8.06 $ 8.48  
Weighted Average Remaining Contractual Term (Yrs) [Abstract]      
Options outstanding , weighted average remaining contractual term (Yrs) 1 year 6 months 14 days 1 year 9 months 10 days 2 years 3 months 10 days
Options exercisable end of year, weighted average remaining contractual term (Yrs) 1 year 6 months 14 days 1 year 9 months 10 days  
Aggregate Intrinsic Value [Abstract]      
Options outstanding, beginning of period $ 2,974 $ 4,225  
Granted 0 0  
Exercised 1,842 1,909 $ 1,800
Forfeited or expired 33 0  
Options outstanding, end of period $ 1,469 2,974 $ 4,225
Options exercisable end of year   $ 2,974