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6. INCOME TAXES - Unrecognized tax benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2021
Unrecognized tax benefits, current $ 0       $ 0   $ 0
Deferred tax assets unrecognized tax benefit 3,400,000       3,400,000    
Provision (benefit) for income taxes 64,000 $ 90,000     (66,000) $ 639,000  
Income (loss) before income taxes $ (4,517,000) $ (5,126,000)     $ (13,423,000) $ (15,884,000)  
Tax benefit, CARES Act             $ 378,000
Effective annual income tax rate (as a percentage)         0.28% (3.40%)  
Israel Tax Authority [Member]              
Provision (benefit) for income taxes       $ 479,000      
Income tax payment     $ 713,000        
Israel Tax Authority [Member] | Accrued expenses and other liabilities              
Income taxes, accrued       $ 713,000