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EMPLOYEE BENEFIT PLANS - Activity related to options under all plans (Details) - $ / shares
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Number of Shares      
Balance, beginning of year 43,332 101,332 141,365
Options exercised (20,000) (58,000) (37,533)
Options expired 0 0 (2,500)
Balance, end of year 23,332 43,332 101,332
Weighted Average Exercise Price      
Balance, beginning of year $ 2.69 $ 3.26 $ 3.77
Options exercised 2.58 3.69 4.84
Options expired 0.00 0.00 8.12
Balance, end of year $ 2.78 $ 2.69 $ 3.26