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EMPLOYEE BENEFIT PLANS: Schedule of activity related to options under all plans (Details) - $ / shares
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Number of Shares      
Balance, beginning of period 223,654 424,654 474,654
Options exercised (3,000) (18,000) (18,000)
Forfeited   (29,000) (32,000)
Expired   (154,000)  
Balance, end of period 220,654 223,654 424,654
Weighted Average Exercise Price      
Balance, beginning of period $ 4.73 $ 8.00 $ 7.91
Options exercised 3.84 3.49 2.69
Forfeited   10.00 9.55
Expired   12.92  
Balance, end of period $ 4.74 $ 4.73 $ 8.00