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Earning Per Share Data - Basic and Diluted Earnings Per Share (Detail) - USD ($)	3 Months Ended						9 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 2,444,000	$ 7,460,000	$ 313,000	$ 2,682,000	$ 3,764,000	$ 2,346,000	$ 10,217,000	$ 8,791,000
Common Shares:
Weighted average common shares outstanding	14,541,000			14,492,000			14,541,000	14,477,000
Effect of dilutive stock options	164,000			232,000			163,000	247,000
Diluted shares outstanding	14,705,000			14,724,000			14,704,000	14,724,000
Basic:
Net earnings per share	$ 0.17			$ 0.19			$ 0.70	$ 0.61
Diluted:
Net earnings per share	$ 0.17			$ 0.18			$ 0.69	$ 0.60

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