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STOCK OPTION PLAN (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Number of Shares [Roll Forward]    
Options outstanding, beginning of period (in shares) 189,088  
Granted (in shares) 0  
Exercised (in shares) (6,111)  
Forfeited or expired (in shares) 0  
Options outstanding, end of period (in shares) 182,977 189,088
Options exercisable, end of period (in shares) 182,977  
Weighted Average Exercise Price [Roll Forward]    
Options outstanding, beginning of period (in dollars per share) $ 25.74  
Granted (in dollars per share) 0  
Exercised (in dollars per share) 28.90  
Forfeited or expired (in dollars per share) 0  
Options outstanding, end of period (in dollars per share) 25.64 $ 25.74
Options exercisable, end of period (in dollars per share) $ 25.64  
Weighted Average Remaining Contractual Term (Yrs) [Abstract]    
Options outstanding 2 years 11 months 5 days 3 years 1 month 28 days
Options exercisable 2 years 11 months 5 days  
Aggregate Intrinsic Value [Abstract]    
Options outstanding, beginning of period $ 3,027,000  
Granted 0  
Exercised 99,000  
Forfeited or expired 0  
Options outstanding, end of period 3,701,000 $ 3,027,000
Options exercisable, end of period $ 3,701,000  
Nonvested Shares Outstanding, Number of Shares [Roll Forward]    
Nonvested shares outstanding, beginning of period (in shares) 44,002  
Granted (in shares) 1,000  
Vested (in shares) (15,208)  
Forfeited or expired (in shares) (313)  
Nonvested shares outstanding, end of period (in shares) 29,481 44,002
Nonvested Shares Outstanding, Weighted Average Fair Value at Grant [Roll Forward]    
Nonvested shares outstanding, beginning of period (in dollars per share) $ 40.80  
Granted (in dollars per share) 45.00  
Vested (in dollars per share) 41.54  
Forfeited or expired (in dollars per share) 41.77  
Nonvested shares outstanding, end of period (in dollars per share) $ 40.56 $ 40.80
Stock based compensation expense not yet recognized in income $ 377,063  
Weighted average remaining period for unrecognized stock based compensation 1 year 9 months 29 days