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6. INCOME TAXES - Unrecognized tax benefits (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
INCOME TAXES          
Unrecognized tax benefits, current $ 0   $ 0   $ 0
Provision for income taxes 33,000 $ 37,000 84,000 $ 97,000  
Income (loss) before income taxes $ (4,022,000) $ (3,191,000) $ (9,081,000) $ (7,107,000)  
Effective annual income tax rate (as a percentage)     (1.53%) (1.69%)