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Note 6 - Marketable Securities | 6 Months Ended
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Jun. 30, 2021
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, 2021 and December 31, 2020, are as follows (in thousands):
|  | As of June 30, 2021 |  |  | As of December 31, 2020 |
Marketable securities: |  |  |  |  |  |  |  |
Amortized cost |  | $ | 114,331 |  |  | $ | 114,531 |
Unrealized gains, net |  |  | 677,805 |  |  |  | 592,423 |
Total fair value |  | $ | 792,136 |  |  | $ | 706,954 |
During the three months ended June 30, 2021 and 2020, there were net unrealized gains on marketable securities of $24.3 million and $526.2 million, respectively. During the six months ended June 30, 2021 and 2020, the net unrealized gains on a marketable securities were $85.4 million and $521.6 million, respectively. These net unrealized gains are included in Gain on marketable securities, net on the Company’s Condensed Consolidated Statements of Income. See Footnote 12 of the Company’s Condensed Consolidated Financial Statements for fair value disclosure.

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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 http://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 http://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 http://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 http://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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