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STOCK-BASED COMPENSATION - Stock Option Activity (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 16, 2020
Sep. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Number Of Options        
Outstanding at the beginning of the period (in shares)   2,719,000 2,916,000  
Exercised (in shares) (150,000)   (150,000)  
Canceled (in shares)   (49,000) (47,000)  
Outstanding at the end of the period (in shares)     2,719,000 2,916,000
Vested or expected to vest at the end of the period (in shares)   2,670,000    
Exercisable and vested at the end of the period (in shares)   2,670,000    
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share)   $ 0.372 $ 0.415  
Exercised (in shares)     0.800  
Outstanding at the end of the period (in dollars per share)     $ 0.372 $ 0.415
Vested or expected to vest at the end of the period (in dollars per share)   0.343    
Exercisable and vested at the end of the period (in dollars per share)   $ 0.343    
Aggregate Intrinsic Value        
Outstanding Value at the beginning of the period   $ 2,476,300 $ 2,546,800  
Outstanding Value at the end of the period     $ 2,476,300 $ 2,546,800
Vested or expected to vest at the end of the period   4,372,000    
Exercisable and vested at the end of the period   $ 4,372,000    
Weighted Average Remaining Contractual Life (in years)        
Outstanding at the end of the period     5 years 7 months 13 days 6 years 2 months 15 days
Vested or expected to vest at the end of the period   5 years 1 month 20 days    
Exercisable and vested at the end of the period   5 years 1 month 20 days