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STOCK PLANS AND STOCK-BASED COMPENSATION - Stock option activity (Details) - $ / shares
9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Shares    
Balance, beginning of year 43,332 101,332
Options exercised (14,000) (58,000)
Balance, end of year 29,332 43,332
Weighted Average Exercise Price    
Balance, beginning of year $ 2.69 $ 3.26
Options exercised 2.49 3.69
Balance, end of year $ 2.78 $ 2.69