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STOCK PLANS AND STOCK-BASED COMPENSATION: Information related to stock options outstanding (Details) - 2017 Equity Incentive Plan - $ / shares
9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Number of Shares    
Balance, beginning of period 220,654 223,654
Options exercised (41,022) (3,000)
Expired (33,000) 0
Balance, end of period 146,632 220,654
Weighted Average Exercise Price    
Balance, beginning of period $ 4.74 $ 4.73
Options exercised 4.01 3.84
Expired 8.49 0
Balance, end of period $ 4.10 $ 4.74