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Earnings Per Share: Schedule of Earnings Per Share, Basic and Diluted (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Details
Net Income (Loss)	$ 4,491us-gaap_NetIncomeLoss	$ 19,423us-gaap_NetIncomeLoss	$ 2,633us-gaap_NetIncomeLoss
Weighted average number of shares outstanding, Basic	22,392,744us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	22,367,174us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	22,342,541us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.87us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic
Effect of dilutive stock options	39,000fil_EffectOfDilutiveStockOptions	2,000fil_EffectOfDilutiveStockOptions
Weighted average number of shares outstanding, Diluted	22,431,839us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	22,369,175us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	22,342,541us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.87us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted

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The amount by which number of shares is adjusted to take into account dilution.

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