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Note 6 - Marketable Securities | 6 Months Ended
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Jun. 30, 2022
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | 6. Marketable Securities The amortized cost and unrealized gains, net of marketable securities as of June 30, 2022 and December 31, 2021, are as follows (in thousands):
|  | As of June 30, 2022 |  |  | As of December 31, 2021 |
Marketable securities: |  |  |  |  |  |  |  |
Amortized cost |  | $ | 115,862 |  |  | $ | 114,159 |
Unrealized gains, net |  |  | 957,844 |  |  |  | 1,097,580 |
Total fair value |  | $ | 1,073,706 |  |  | $ | 1,211,739 |
During the three months ended June 30, 2022 and 2021, the Company recognized net unrealized losses on marketable securities of $261.5 million and net unrealized gains on marketable securities of $24.3 million, respectively. During the six months ended June 30, 2022 and 2021, the Company recognized net unrealized losses on marketable securities of $139.7 million and net unrealized gains on marketable securities of $85.4 million, respectively. These net unrealized gains and losses are included in (Loss)/gain on marketable securities, net on the Company’s Condensed Consolidated Statements of Operations.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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