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7. FINANCIAL INSTRUMENTS - Available-for-sale investments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | ---
Available-for-sale investments |  |
Cost | $ 15,174 |
Total | 15,169 |
Short-term investments |  |
Available-for-sale investments |  |
Cost | 11,777 | $ 9,679
Gross Unrealized Gains | 4 | 38
Gross Unrealized Losses | (8) |
Total | 11,773 | 9,717
Short-term investments | Certificates of deposit |  |
Available-for-sale investments |  |
Cost | 5,750 | 1,495
Gross Unrealized Gains | 2 | 13
Gross Unrealized Losses | (5) |
Total | 5,747 | 1,508
Short-term investments | Supranational obligations |  |
Available-for-sale investments |  |
Cost | 2,012 | 2,273
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (2) |
Total | 2,011 | 2,274
Short-term investments | Agency bonds |  |
Available-for-sale investments |  |
Cost | 4,015 | 5,911
Gross Unrealized Gains | 1 | 24
Gross Unrealized Losses | (1) |
Total | 4,015 | 5,935
Long-term investment |  |
Available-for-sale investments |  |
Cost | 3,397 | 5,774
Gross Unrealized Gains | 6 | 20
Gross Unrealized Losses | (7) | (2)
Total | 3,396 | 5,792
Long-term investment | Certificates of deposit |  |
Available-for-sale investments |  |
Cost | 1,750 | 3,750
Gross Unrealized Gains | 5 | 19
Gross Unrealized Losses | (3) | (1)
Total | 1,752 | 3,768
Long-term investment | Supranational obligations |  |
Available-for-sale investments |  |
Cost | 651 | 1,023
Gross Unrealized Losses | (2) | (1)
Total | 649 | 1,022
Long-term investment | Agency bonds |  |
Available-for-sale investments |  |
Cost | 996 | 1,001
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (2) |
Total | $ 995 | $ 1,002

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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=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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