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STOCK PLANS AND STOCK-BASED COMPENSATION (Details) - $ / shares
6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Number of Shares    
Balance, beginning of period 141,365 220,654
Options exercised (28,533) (23,022)
Expired (2,500) (15,000)
Balance, end of period 110,332 182,632
Weighted Average Exercise Price    
Balance, beginning of period $ 3.77 $ 4.74
Options exercised 5.30 4.43
Expired 8.12 14.49
Balance, end of period $ 3.27 $ 3.98