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STOCK PLANS AND STOCK-BASED COMPENSATION - Stock options outstanding (Details) - USD ($)
3 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Stock options fully vested and expected to vest:    
Number 7,511 15,821
Weighted average exercise price $ 2.78 $ 2.78
Aggregate intrinsic value (1) $ 17,000 $ 60,000
Weighted average contractual term of options (years) 14 days 1 year 14 days
Stock options fully vested and currently exercisable:    
Number 7,511 15,821
Weighted average exercise price $ 2.78 $ 2.78
Aggregate intrinsic value (1) $ 17,000 $ 60,000
Weighted average contractual term of options (years) 14 days 1 year 14 days