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6. INCOME TAXES - Statutory income tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
INCOME TAXES
U.S. Federal taxes at statutory rate	$ (4,446)	$ (2,120)	$ 56
State taxes, net of federal benefit	(1)		(2)
Settlement of uncertain tax positions	524
Stock-based compensation	482	(58)	(124)
Tax credits	(509)	(494)	(536)
Foreign tax rate differential	2,419	593	117
Tax exempt interest	(5)	(16)	(4)
Non-deductible expenses and other	(2)	38	17
Income tax expense (benefit) before change in valuation allowance	(1,538)	(2,057)	(476)
Valuation allowance	1,873	2,304	581
Provision for income taxes	$ 335	$ 247	$ 105

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to non deductible expenses and other adjustments

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