7. FINANCIAL INSTRUMENTS - Unrealized losses and fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023
Fair Value
12 Months or Greater, Fair Value	$ 651	$ 3,363
Total, Fair Value	651	3,363
Unrealized Loss
12 Months or Greater, Unrealized Loss	(4)	(40)
Total, Unrealized Loss	(4)	(40)
Certificates of deposit
Fair Value
12 Months or Greater, Fair Value		1,737
Total, Fair Value		1,737
Unrealized Loss
12 Months or Greater, Unrealized Loss		(13)
Total, Unrealized Loss		(13)
Agency bonds
Fair Value
12 Months or Greater, Fair Value		990
Total, Fair Value		990
Unrealized Loss
12 Months or Greater, Unrealized Loss		(10)
Total, Unrealized Loss		(10)
Supranational obligations
Fair Value
12 Months or Greater, Fair Value	651	636
Total, Fair Value	651	636
Unrealized Loss
12 Months or Greater, Unrealized Loss	(4)	(17)
Total, Unrealized Loss	$ (4)	$ (17)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

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