4. BALANCE SHEET DETAIL - Property and equipment, net (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Property and equipment, net:
Property and equipment, gross	$ 31,455,000	$ 31,070,000
Less: Accumulated depreciation	(24,096,000)	(23,742,000)
Total property and equipment, net	7,359,000	7,328,000
Depreciation	771,000	981,000	$ 1,200,000
Computer and other equipment
Property and equipment, net:
Property and equipment, gross	18,415,000	18,359,000
Software
Property and equipment, net:
Property and equipment, gross	4,425,000	4,097,000
Land
Property and equipment, net:
Property and equipment, gross	3,900,000	3,900,000
Building and building improvements
Property and equipment, net:
Property and equipment, gross	3,735,000	3,735,000
Furniture and fixtures
Property and equipment, net:
Property and equipment, gross	102,000	102,000
Leasehold improvements
Property and equipment, net:
Property and equipment, gross	$ 878,000	$ 877,000