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7. FINANCIAL INSTRUMENTS - Unrealized losses and fair value (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Fair Value |  |
Less Than 12 Months, Fair Value | $ 3,536 | $ 2,498
Total, Fair Value | 3,536 | 2,498
Unrealized Loss |  |
Less Than 12 Months, Unrealized Loss | 2 | 2
Total, Unrealized Loss | 2 | 2
Certificates of deposit |  |
Fair Value |  |
Less Than 12 Months, Fair Value | 1,499 | 2,498
Total, Fair Value | 1,499 | 2,498
Unrealized Loss |  |
Less Than 12 Months, Unrealized Loss | 1 | 2
Total, Unrealized Loss | 1 | $ 2
Supranational obligations |  |
Fair Value |  |
Less Than 12 Months, Fair Value | 2,037 |
Total, Fair Value | 2,037 |
Unrealized Loss |  |
Less Than 12 Months, Unrealized Loss | 1 |
Total, Unrealized Loss | $ 1 |

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- Definition 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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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- Definition 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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 + Details
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