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Schedule of Basic Earning Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income	$ 9,954us-gaap_NetIncomeLoss	$ 6,635us-gaap_NetIncomeLoss	$ 7,862us-gaap_NetIncomeLoss
Dividends accumulated for the period	(3,815)us-gaap_PreferredStockDividendsIncomeStatementImpact	(4,879)us-gaap_PreferredStockDividendsIncomeStatementImpact	(4,530)us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income available to shareholders of ordinary shares	$ 6,139us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1,756us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 3,332us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:
Shares used in computing net income per ordinary shares, basic	13,335,059us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	6,900,433us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	6,592,997us-gaap_WeightedAverageNumberOfSharesOutstandingBasic

X

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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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