2. REVENUE RECOGNITION - Revenue disaggregated (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net revenues	$ 33,384	$ 27,729	$ 43,343
Contract Manufacturers
Disaggregation of Revenue [Line Items]
Net revenues	10,354	12,127	14,603
Distribution
Disaggregation of Revenue [Line Items]
Net revenues	22,289	15,172	26,555
OEMs
Disaggregation of Revenue [Line Items]
Net revenues	$ 741	$ 430	$ 2,185