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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

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