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Stock Plans And Stock-Based Compensation: Schedule of Stock Options Outstanding (Details) - 1998 and 2003 Stock Option Plan - $ / shares
6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Number of Shares    
Number of Shares Balance, beginning of period 223,654 424,654
Weighted Average Exercise Price Balance, beginning of period $ 4.73 $ 8.00
Number of Shares Options exercised (18,000)
Weighted Average Exercise Price Options exercised $ 3.49
Number of Shares Forfeited (8,000)
Weighted Average Exercise Price Forfeited $ 12.98
Number of Shares Expired (8,000)
Weighted Average Exercise Price Expired $ 11.79
Number of Shares Balance, end of period 223,654 390,654
Weighted Average Exercise Price Balance, end of period $ 4.73 $ 8.03