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AVERAGE SHARE INFORMATION (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Basic:          
Weighted average common shares outstanding (in shares) 8,713,638 8,727,238 8,700,489 8,724,493  
Diluted:          
Weighted average common shares outstanding (in shares) 8,713,638 8,727,238 8,700,489 8,724,493  
Dilutive potential common shares stock options (in shares) 181,636 77,346 160,518 63,002  
Weighted average diluted shares outstanding (in shares) 8,895,274 8,804,584 8,861,007 8,787,495  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 295,550 711,512 455,912 728,688  
Net Income (Loss) Attributable to Parent $ 9,799,345 $ 15,491,465 $ 22,867,031 $ 32,109,419 $ 73,600,294
Earnings Per Share, Basic $ 1.12 $ 1.78 $ 2.63 $ 3.68  
Earnings Per Share, Diluted $ 1.10 $ 1.76 $ 2.58 $ 3.65