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STOCK PLANS AND STOCK-BASED COMPENSATION - Stock option activity (Details) - $ / shares
6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Number of Shares    
Balance, beginning of year 43,332 101,332
Options exercised (5,000) (58,000)
Balance, end of year 38,332 43,332
Weighted Average Exercise Price    
Balance, beginning of year $ 2.69 $ 3.26
Options exercised 1.97 3.69
Balance, end of year $ 2.78 $ 2.69