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STOCK OPTION PLAN (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Sep. 30, 2014
Number of Shares [Roll Forward]      
Options outstanding, beginning of period (in shares)   235,766  
Granted (in shares)   0  
Exercised (in shares)   (15,146)  
Forfeited or expired (in shares)   0  
Options outstanding, end of period (in shares) 220,620 220,620 235,766
Options exercisable, end of period (in shares) 220,620 220,620  
Weighted Average Exercise Price [Roll Forward]      
Options outstanding, beginning of period (in dollars per share)   $ 25.20  
Granted (in dollars per share)   0  
Exercised (in dollars per share)   25.06  
Forfeited or expired (in dollars per share)   0  
Options outstanding, end of period (in dollars per share) $ 25.21 25.21 $ 25.20
Options exercisable, end of period (in dollars per share) $ 25.21 $ 25.21  
Weighted Average Remaining Contractual Term (Yrs) [Abstract]      
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 3 years 4 days   3 years 9 months 11 days
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 3 years 4 days   3 years 9 months 11 days
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1 3 years 4 days    
Aggregate Intrinsic Value [Abstract]      
Options outstanding, beginning of period   $ 2,507,000  
Granted   0  
Exercised   248,000  
Forfeited or expired   0  
Options outstanding, end of period $ 3,902,000 3,902,000 $ 2,507,000
Options exercisable, end of period $ 3,902,000 $ 3,902,000  
Nonvested Shares Outstanding, Number of Shares [Roll Forward]      
Nonvested shares outstanding, beginning of period (in shares)   4,000  
Granted (in shares)   5,680  
Vested (in shares)   (5,450)  
Forfeited or expired (in shares)   0  
Nonvested shares outstanding, end of period (in shares) 4,230 4,230 4,000
Nonvested Shares Outstanding, Weighted Average Fair Value at Grant [Roll Forward]      
Nonvested shares outstanding, beginning of period (in dollars per share)   $ 28.61  
Granted (in dollars per share)   35.62  
Vested (in dollars per share)   33.62  
Forfeited or expired (in dollars per share)   0  
Nonvested shares outstanding, end of period (in dollars per share) $ 31.55 $ 31.55 $ 28.61
Stock based compensation expense not yet recognized in income $ 70,584 $ 70,584  
Weighted average remaining period for unrecognized stock based compensation   1 year 9 months 18 days