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Employee Benefit Plans: Schedule of activity related to options under all plans (Details) (USD $)
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Details      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning Balance 407,500 440,500 468,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning Balance $ 9.05 $ 8.87 $ 9.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 87,154    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 2.78    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period   (3,000) (28,200)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price   $ 1.97 $ 11.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (20,000) (30,000)  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price $ 8.98 $ 7.00  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 474,654 407,500 440,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance $ 7.91 $ 9.05 $ 8.87