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Earnings per share computations (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Weighted average common shares outstanding during the period - shares used for basic earnings per common share	9,711us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,568us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Common shares issuable under share based payment plans which are potentially dilutive	60us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	106us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Common shares used for diluted earnings per common share	9,771us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,674us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income	$ 2,793us-gaap_NetIncomeLoss	$ 2,341us-gaap_NetIncomeLoss
Earnings per common share
Basic	$ 0.29us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic
Diluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted

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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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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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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