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Earning Per Share Data - Basic and Diluted Earnings Per Share (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 2,346,000	$ 1,394,000
Common Shares:
Weighted-average common shares outstanding	14,458,000	14,380,000
Effect of dilutive stock options	265,000	209,000
Weighted-average diluted shares outstanding	14,723,000	14,589,000
Basic:
Net income per share	$ 0.16	$ 0.10
Diluted:
Net income per share	$ 0.16	$ 0.10

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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