6. INCOME TAXES - Unrecognized tax benefits (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Unrecognized tax benefits, noncurrent			$ 0	$ 0
Deferred tax assets unrecognized tax benefit			3,500,000	3,300,000
Deferred tax assets, gross			16,394,000	13,209,000
Valuation allowance			(16,183,000)	(13,017,000)
Net deferred tax asset			16,200,000	13,000,000.0
Provision (benefit) for income taxes			(45,000)	335,000	$ 247,000
Income (loss) before income taxes			(16,413,000)	(21,170,000)	(10,090,000)
Deferred tax liability			11,000	9,000
Tax benefit, CARES Act				378,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of period		$ 3,321,000	3,273,000	3,321,000	3,102,000
Additions based on tax positions related to current year			229,000	233,000	394,000
Settlements during the period				(203,000)
Reductions based on tax positions related to prior years				(78,000)	(158,000)
Lapses during the current year applicable to statutes of limitations					(17,000)
Unrecognized tax benefits, end of period			$ 3,502,000	$ 3,273,000	$ 3,321,000
Accrued expenses and other liabilities
Income taxes, accrued		713,000
Israel Tax Authority [Member]
Provision (benefit) for income taxes		$ 479,000
Income tax payment	$ 713,000