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Nature of Operations and Summary of Significant Accounting Policies - Basic and Diluted EPS (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ 12,564,000	$ 8,418,000
Net Income Diluted	$ 12,564,000	$ 8,418,000
Weighted average common shares outstanding	14,492,000	14,396,000
Common Stock Equivalents	231,000	284,000
Diluted shares outstanding	14,723,000	14,680,000
Basic earnings per common share:
Basic earnings per share	$ 0.87	$ 0.58
Diluted earnings per common share:
Diluted earnings per share	$ 0.85	$ 0.57

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