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Note 8 - Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] |
|  | As of December 31, |
|  | 2020 |  |  | 2019 |
U.S. government agency MBS and CMOs |  | $ | 162,031 |  |  | $ | 196,146 |
U.S. government agency debt securities |  |  | 6,904 |  |  |  | 14,680 |
RMBS |  |  | 14 |  |  |  | 15 |
U.S. Treasury securities |  |  | 607 |  |  |  | 11,105 |
ABS |  |  | 1 |  |  |  | 100 |
SBA loans |  |  | 2,742 |  |  |  | 27,634 |
Corporate bonds and redeemable preferred stock |  |  | 36,388 |  |  |  | 38,503 |
Foreign government bonds |  |  | 659 |  |  |  | 844 |
Municipal bonds |  |  | 19,400 |  |  |  | 13,737 |
Certificates of deposit |  |  | 70 |  |  |  | 841 |
Derivatives |  |  | 13,717 |  |  |  | 3,686 |
Equity securities |  |  | 428 |  |  |  | 561 |
Investments-trading |  | $ | 242,961 |  |  | $ | 307,852 |
Investments Sold, Not yet Purchased [Table Text Block] |
|  | As of December 31, |
|  | 2020 |  |  | 2019 |
U.S. Treasury securities |  | $ | 3,348 |  |  | $ | 16,827 |
Corporate bonds and redeemable preferred stock |  |  | 29,206 |  |  |  | 58,083 |
Municipal bonds |  |  | 20 |  |  |  | 20 |
Derivatives |  |  | 11,822 |  |  |  | 3,017 |
Equity securities |  |  | 43 |  |  |  | - |
Trading securities sold, not yet purchased |  | $ | 44,439 |  |  | $ | 77,947 |
|  | As of December 31, 2020 |
|  | Cost |  |  | Carrying Value |  |  | Unrealized Gain / (Loss) |
Derivatives |  | $ | 338 |  |  | $ | 233 |  |  |  | 105 |
Equity securities |  |  | 7,223 |  |  |  | 7,182 |  |  |  | 41 |
Other investments sold, not yet purchased |  | $ | 7,561 |  |  | $ | 7,415 |  |  | $ | 146 |
Schedule of Other Investments at Fair Value [Table Text Block] |
|  | As of December 31, 2020 |
|  | Cost |  |  | Carrying Value |  |  | Unrealized Gain / (Loss) |
Equity securities |  | $ | 15,605 |  |  | $ | 51,593 |  |  | $ | 35,988 |
Corporate bonds and redeemable preferred stock |  |  | 479 |  |  |  | 476 |  |  |  | (3 | )
Subordinated Notes |  |  | 1,485 |  |  |  | 1,519 |  |  |  | 34 |
RTLs |  |  | 2,243 |  |  |  | 2,300 |  |  |  | 57 |
U.S. Insurance JV |  |  | 1,168 |  |  |  | 1,564 |  |  |  | 396 |
SPAC Funds |  |  | 779 |  |  |  | 984 |  |  |  | 205 |
Residential loans |  |  | 119 |  |  |  | 104 |  |  |  | (15 | )
Other investments, at fair value |  | $ | 21,878 |  |  | $ | 58,540 |  |  | $ | 36,662 |
|  | As of December 31, 2019 |
|  | Cost |  |  | Carrying Value |  |  | Unrealized Gain / (Loss) |
Equity securities |  | $ | 8,119 |  |  | $ | 8,875 |  |  | $ | 756 |
Corporate bonds and redeemable preferred stock |  |  | 479 |  |  |  | 477 |  |  |  | (2 | )
CLOs |  |  | 2,894 |  |  |  | 2,522 |  |  |  | (372 | )
U.S. Insurance JV |  |  | 2,048 |  |  |  | 2,223 |  |  |  | 175 |
SPAC Funds |  |  | 646 |  |  |  | 668 |  |  |  | 22 |
Residential loans |  |  | 129 |  |  |  | 99 |  |  |  | (30 | )
Other investments, at fair value |  | $ | 14,315 |  |  | $ | 14,864 |  |  | $ | 549 |

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