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STOCK PLANS AND STOCK-BASED COMPENSATION - Stock options outstanding (Details) - USD ($)
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Stock options fully vested and expected to vest:    
Number 23,332 38,332
Weighted average exercise price $ 2.78 $ 2.78
Aggregate intrinsic value (1) $ 101,000 $ 110,000
Weighted average contractual term of options (years) 2 years 14 days 2 years 10 months 6 days
Stock options fully vested and currently exercisable:    
Number 23,332 38,332
Weighted average exercise price $ 2.78 $ 2.78
Aggregate intrinsic value (1) $ 101,000 $ 110,000
Weighted average contractual term of options (years) 2 years 14 days 2 years 10 months 6 days