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7. FINANCIAL INSTRUMENTS (Details)	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Nov. 23, 2015
Fair value measurements
Discount rate	16.3		14.8
Short-term investments	$ 5,422,000	$ 6,992,000
Long-term investments	$ 628,000	3,345,000
Minimum
Fair value measurements
Probability rate	0
Maximum
Fair value measurements
Probability rate	0.80
Fair Value, Inputs, Level 2 \| Available-for-sale Securities
Fair value measurements
Short-term investments	$ 5,400,000
Long-term investments	628,000
Other accrued expenses
Fair value measurements
Contingent consideration liability	1,900,000	2,700,000
Fair Value, Measurements, Recurring
Fair value measurements
Assets	17,533,000	26,479,000
Liabilities	1,908,000	2,738,000
Fair Value, Measurements, Recurring \| Money Market Funds
Fair value measurements
Money market funds	11,483,000	16,142,000
Fair Value, Measurements, Recurring \| Available-for-sale Securities
Fair value measurements
Marketable securities	6,050,000	10,337,000
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1
Fair value measurements
Assets	11,483,000	16,142,000
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1 \| Money Market Funds
Fair value measurements
Money market funds	11,483,000	16,142,000
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Fair value measurements
Assets	6,050,000	10,337,000
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 \| Available-for-sale Securities
Fair value measurements
Marketable securities	6,050,000	10,337,000
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 3
Fair value measurements
Liabilities	$ 1,908,000	$ 2,738,000