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7. FINANCIAL INSTRUMENTS - Unrealized losses and fair value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | ---
Fair Value |  |
Less Than 12 Months, Fair Value | $ 7,691 | $ 2,498
Total, Fair Value | 7,691 | 2,498
Unrealized Loss |  |
Less Than 12 Months, Unrealized Loss | 3 | 2
Total, Unrealized Loss | 3 | 2
Certificates of deposit |  |
Fair Value |  |
Less Than 12 Months, Fair Value | 250 | 2,498
Total, Fair Value | 250 | 2,498
Unrealized Loss |  |
Less Than 12 Months, Unrealized Loss | 1 | 2
Total, Unrealized Loss | 1 | $ 2
Agency bonds |  |
Fair Value |  |
Less Than 12 Months, Fair Value | 4,918 |
Total, Fair Value | 4,918 |
Unrealized Loss |  |
Less Than 12 Months, Unrealized Loss | 1 |
Total, Unrealized Loss | 1 |
Supranational obligations |  |
Fair Value |  |
Less Than 12 Months, Fair Value | 2,523 |
Total, Fair Value | 2,523 |
Unrealized Loss |  |
Less Than 12 Months, Unrealized Loss | 1 |
Total, Unrealized Loss | $ 1 |

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