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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Dec. 31, 2020
STOCKHOLDERS' EQUITY (DEFICIT)  
Assumptions used in fair value method
    Three Months Ended
December 31		     Nine Months Ended
December 31		  
    2020     2019     2020     2019  
Risk-free interest rates     .38 %     1.51% - 1.69 %     .28% - .38 %      1.34% - 2.41 %
Volatility     87 %     87% - 96 %     87% - 127 %      87% - 102 %
Expected life (years)     5.2 - 5.7        5.0 - 6.0       5.0 - 6.0        5.0 - 6.0  
Dividend yield     —       —       —       —  
Stock option activity
          Options Outstanding  
                Weighted  
    Shares           Average  
    Available     Number of     Exercise  
    for Grant     Shares     Prices  
Balance at March 31, 2020     822,055       3,177,945     $ 1.58  
Options granted     (230,476 )     230,476       2.88  
Options cancelled and returned to the Plan     833       (833 )     2.25  
Balance at June 30, 2020     592,412       3,407,588       1.67  
Options granted     (72,500 )     72,500       2.87  
Balance at September 30, 2020     519,912       3,480,088       1.70  
Options granted     (52,500 )     52,500       2.87  
Options cancelled and returned to the Plan     20,000       (20,000 )     2.25  
Balance at December 31, 2020     487,412       3,512,588       1.71  
Range of outstanding and exercisable options
    Options Outstanding     Options Exercisable  
Range of Exercise Price   Number
Outstanding		     Weighted
Average
Remaining
Contractual
Life
(in Years)		     Weighted
Average
Exercise
Price		     Number
Exercisable		     Weighted
Average
Exercise
Price		     Aggregate
Intrinsic
value		  
$0.66 - $3.16     3,512,588       8.44     $ 1.71       1,927,052     $ 1.16     $ 4,036,117