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Note 8 - Financial Instruments - Investments - Trading (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investments-trading | $ 242,961 | $ 307,852
Corporate Bonds and Redeemable Preferred Stock [Member] |  |
Investments-trading | 36,388 | 38,503
Foreign Government Bonds [Member] |  |
Investments-trading | 659 | 844
Municipal Bonds [Member] |  |
Investments-trading | 19,400 | 13,737
Certificates of Deposit [Member] |  |
Investments-trading | 70 | 841
Derivative [Member] |  |
Investments-trading | 13,717 | 3,686
Equity Securities [Member] |  |
Investments-trading | 428 | 561
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Debt securities | 162,031 | 196,146
US Government Agencies Debt Securities [Member] |  |
Debt securities | 6,904 | 14,680
Residential Mortgage Backed Securities [Member] |  |
Debt securities | 14 | 15
US Treasury Securities [Member] |  |
Debt securities | 607 | 11,105
Asset-backed Securities [Member] |  |
Debt securities | 1 | 100
Small Business Administration Loans [Member] |  |
Debt securities | $ 2,742 | $ 27,634

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + 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 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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