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Note 8 - Financial Instruments - Other Investments, at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Other investments, amortized cost | $ 21,878 | $ 14,315
Other investments, carrying value | 58,540 | 14,864
Other investments, unrealized gain (loss) | 36,662 | 549
Other investments, at fair value | 58,540 | 14,864
Corporate Bonds and Redeemable Preferred Stock [Member] |  |
Other investments, amortized cost | 479 | 479
Other investments, carrying value | 476 | 477
Other investments, unrealized gain (loss) | (3) | (2)
Other investments, at fair value | 476 | 477
Subordinated Notes [Member] |  |
Other investments, amortized cost | 1,485 |
Other investments, carrying value | 1,519 |
Other investments, unrealized gain (loss) | 34 |
Other investments, at fair value | 1,519 |
Collateralized Loan Obligations [Member] |  |
Other investments, amortized cost |  | 2,894
Other investments, carrying value |  | 2,522
Other investments, unrealized gain (loss) |  | (372)
Other investments, at fair value |  | 2,522
U.S. Insurance JV [Member] |  |
Other investments, amortized cost | 1,168 | 2,048
Other investments, carrying value | 1,564 | 2,223
Other investments, unrealized gain (loss) | 396 | 175
Other investments, at fair value | 1,564 | 2,223
SPAC Fund [Member] |  |
Other investments, amortized cost | 779 | 646
Other investments, carrying value | 984 | 668
Other investments, unrealized gain (loss) | 205 | 22
Other investments, at fair value | 984 | 668
Residential Mortgage [Member] |  |
Other investments, amortized cost | 119 | 129
Other investments, carrying value | 104 | 99
Other investments, unrealized gain (loss) | (15) | (30)
Other investments, at fair value | 104 | 99
Equity Securities [Member] |  |
Other investments, amortized cost | 15,605 | 8,119
Other investments, carrying value | 51,593 | 8,875
Other investments, unrealized gain (loss) | 35,988 | 756
Other investments, at fair value | 51,593 | $ 8,875
Residential Transition Loans [Member] |  |
Other investments, amortized cost | 2,243 |
Other investments, carrying value | 2,300 |
Other investments, unrealized gain (loss) | 57 |
Other investments, at fair value | $ 2,300 |

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- Definition Amount of investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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