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7. FINANCIAL INSTRUMENTS - Available-for-sale investments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | ---
Available-for-sale investments |  |
Cost | $ 19,243 |
Total | 19,322 |
Short-term investments |  |
Available-for-sale investments |  |
Cost | 9,178 | $ 14,989
Gross Unrealized Gains | 19 | 73
Gross Unrealized Losses | (1) | (1)
Total | 9,196 | 15,061
Short-term investments | Certificates of deposit |  |
Available-for-sale investments |  |
Cost | 2,495 | 12,000
Gross Unrealized Gains | 14 | 52
Gross Unrealized Losses |  | (1)
Total | 2,509 | 12,051
Short-term investments | Supranational obligations |  |
Available-for-sale investments |  |
Cost | 2,765 |
Gross Unrealized Gains | 5 |
Total | 2,770 |
Short-term investments | Agency bonds |  |
Available-for-sale investments |  |
Cost | 3,918 | 2,989
Gross Unrealized Gains |  | 21
Gross Unrealized Losses | (1) |
Total | 3,917 | 3,010
Long-term investment |  |
Available-for-sale investments |  |
Cost | 10,065 | 4,044
Gross Unrealized Gains | 62 | 73
Gross Unrealized Losses | (1) |
Total | 10,126 | 4,117
Long-term investment | Certificates of deposit |  |
Available-for-sale investments |  |
Cost | 4,000 | 745
Gross Unrealized Gains | 31 | 18
Total | 4,031 | 763
Long-term investment | Supranational obligations |  |
Available-for-sale investments |  |
Cost | 2,047 | 1,270
Gross Unrealized Gains |  | 13
Gross Unrealized Losses | (1) |
Total | 2,046 | 1,283
Long-term investment | Agency bonds |  |
Available-for-sale investments |  |
Cost | 4,018 | 2,029
Gross Unrealized Gains | 31 | 42
Total | $ 4,049 | $ 2,071

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://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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