6. INCOME TAXES - Unrecognized tax benefits (Details) - USD ($)	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020
Unrecognized tax benefits, current	$ 0		$ 0
Unrecognized tax benefits, noncurrent	326,000		613,000
Deferred tax assets unrecognized tax benefit	2,800,000
Valuation allowance	(9,900,000)		(9,400,000)
Net deferred tax asset	9,900,000		$ 9,400,000
Provision for income taxes	$ 487,000	$ 43,000
Effective annual income tax rate (as a percentage)	(4.00%)	(8.70%)
Israel Tax Authority [Member]
Provision for income taxes	$ 479,000
Israel Tax Authority [Member] | Accrued expenses and other liabilities
Income taxes, accrued	$ 713,000