7. FINANCIAL INSTRUMENTS - Unrealized losses and fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Fair Value
Less Than 12 Months, Fair Value	$ 9,590	$ 3,536
12 Months or Greater, Fair Value	246
Total, Fair Value	9,836	3,536
Unrealized Loss
Less Than 12 Months, Unrealized Loss	(76)	(2)
12 Months or Greater, Unrealized Loss	(3)
Total, Unrealized Loss	(79)	(2)
Certificates of Deposit
Fair Value
Less Than 12 Months, Fair Value	4,974	1,499
12 Months or Greater, Fair Value	246
Total, Fair Value	5,220	1,499
Unrealized Loss
Less Than 12 Months, Unrealized Loss	(26)	(1)
12 Months or Greater, Unrealized Loss	(3)
Total, Unrealized Loss	(29)	(1)
Bonds
Fair Value
Less Than 12 Months, Fair Value	2,982
Total, Fair Value	2,982
Unrealized Loss
Less Than 12 Months, Unrealized Loss	(26)
Total, Unrealized Loss	(26)
Supranational obligations
Fair Value
Less Than 12 Months, Fair Value	1,634	2,037
Total, Fair Value	1,634	2,037
Unrealized Loss
Less Than 12 Months, Unrealized Loss	(24)	(1)
Total, Unrealized Loss	$ (24)	$ (1)