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Note 14 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Recurring [Member] |  |
Marketable equity securities | $ 1,249,125 | $ 706,954
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Marketable equity securities | 1,249,125 | 706,954
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Marketable equity securities | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Marketable equity securities |  | 0
Fair Value, Nonrecurring [Member] |  |
Other investments | 9,834 | 5,464
Real estate |  | 24,899
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Other investments | 0 | 0
Real estate |  | 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Other investments | 0 | 0
Real estate |  | 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Other investments | $ 9,834 | 5,464
Real estate |  | $ 24,899

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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