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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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