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7. FINANCIAL INSTRUMENTS - Available-for-sale investments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Available-for-sale investments |  |
Cost | $ 15,453 |
Total | 15,509 |
Short-term investments |  |
Available-for-sale investments |  |
Cost | 9,679 | $ 14,989
Gross Unrealized Gains | 38 | 73
Gross Unrealized Losses |  | (1)
Total | 9,717 | 15,061
Short-term investments | Certificates of deposit |  |
Available-for-sale investments |  |
Cost | 1,495 | 12,000
Gross Unrealized Gains | 13 | 52
Gross Unrealized Losses |  | (1)
Total | 1,508 | 12,051
Short-term investments | Supranational obligations |  |
Available-for-sale investments |  |
Cost | 2,273 |
Gross Unrealized Gains | 1 |
Total | 2,274 |
Short-term investments | Agency bonds |  |
Available-for-sale investments |  |
Cost | 5,911 | 2,989
Gross Unrealized Gains | 24 | 21
Total | 5,935 | 3,010
Long-term investment |  |
Available-for-sale investments |  |
Cost | 5,774 | 4,044
Gross Unrealized Gains | 20 | 73
Gross Unrealized Losses | (2) |
Total | 5,792 | 4,117
Long-term investment | Certificates of deposit |  |
Available-for-sale investments |  |
Cost | 3,750 | 745
Gross Unrealized Gains | 19 | 18
Gross Unrealized Losses | (1) |
Total | 3,768 | 763
Long-term investment | Supranational obligations |  |
Available-for-sale investments |  |
Cost | 1,023 | 1,270
Gross Unrealized Gains |  | 13
Gross Unrealized Losses | (1) |
Total | 1,022 | 1,283
Long-term investment | Agency bonds |  |
Available-for-sale investments |  |
Cost | 1,001 | 2,029
Gross Unrealized Gains | 1 | 42
Total | $ 1,002 | $ 2,071

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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