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Note 9 - Fair Value Disclosures - Fair Value Measurements on a Recurring Basis (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Investments-trading		$ 223,865	$ 242,961
Total other investments, at fair value		56,033	58,540
Investment securities sold, not yet purchased		62,512	44,439
Other investments, sold not yet purchased		2,488	7,415
Corporate Bonds and Redeemable Preferred Stock [Member]
Investments-trading		45,519	36,388
Investment securities sold, not yet purchased		32,574	29,206
Foreign Government Bonds [Member]
Investments-trading		467	659
Municipal Bonds [Member]
Investments-trading		18,841	19,400
Investment securities sold, not yet purchased		0	20
Certificates of Deposit [Member]
Investments-trading		169	70
Derivative [Member]
Investments-trading		1,275	13,717
Investment securities sold, not yet purchased		424	11,822
Other investments, sold not yet purchased		0	7,182
Equity Securities [Member]
Investments-trading		1,118	428
Total other investments, at fair value		24,733	17,421
Investment securities sold, not yet purchased		0	43
Other investments, sold not yet purchased		2,488	233
Restricted Equity Securities [Member]
Total other investments, at fair value		19,449	34,172
Subordinated Debt [Member]
Total other investments, at fair value		0	1,519
Residential Transition Loans [Member]
Total other investments, at fair value		0	2,300
Fair Value, Recurring [Member]
Investments-trading		223,865	242,961
Total other investments, at fair value		56,033	58,540
Investment securities sold, not yet purchased		62,512	44,439
Other investments, sold not yet purchased		2,488	7,415
Fair Value, Recurring [Member] | Corporate Bonds and Redeemable Preferred Stock [Member]
Investments-trading		45,519	36,388
Total other investments, at fair value		476	476
Investment securities sold, not yet purchased		32,574	29,206
Fair Value, Recurring [Member] | Foreign Government Bonds [Member]
Investments-trading		467	659
Fair Value, Recurring [Member] | Municipal Bonds [Member]
Investments-trading		18,841	19,400
Investment securities sold, not yet purchased			20
Fair Value, Recurring [Member] | Certificates of Deposit [Member]
Investments-trading		169	70
Fair Value, Recurring [Member] | Derivative [Member]
Investments-trading		1,275	13,717
Investment securities sold, not yet purchased		424	11,822
Other investments, sold not yet purchased			233
Fair Value, Recurring [Member] | Equity Securities [Member]
Investments-trading		1,118	428
Total other investments, at fair value		24,733	17,421
Investment securities sold, not yet purchased		2,488	43
Other investments, sold not yet purchased			7,182
Fair Value, Recurring [Member] | Restricted Equity Securities [Member]
Total other investments, at fair value		19,449	34,172
Fair Value, Recurring [Member] | Subordinated Debt [Member]
Total other investments, at fair value			1,519
Fair Value, Recurring [Member] | Residential Transition Loans [Member]
Total other investments, at fair value			2,300
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investments-trading		0	607
Investment securities sold, not yet purchased		29,514	3,391
Other investments, sold not yet purchased		2,488	7,415
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Bonds and Redeemable Preferred Stock [Member]
Investments-trading		0	0
Total other investments, at fair value		0	0
Investment securities sold, not yet purchased		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Bonds [Member]
Investments-trading		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member]
Investments-trading		0	0
Investment securities sold, not yet purchased			0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Investments-trading		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Derivative [Member]
Investments-trading		0	0
Investment securities sold, not yet purchased		0	0
Other investments, sold not yet purchased			233
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Investments-trading		0	0
Total other investments, at fair value		24,733	17,421
Investment securities sold, not yet purchased		2,488	43
Other investments, sold not yet purchased			7,182
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Restricted Equity Securities [Member]
Total other investments, at fair value		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Subordinated Debt [Member]
Total other investments, at fair value			0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential Transition Loans [Member]
Total other investments, at fair value			0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investments-trading		223,865	242,354
Investment securities sold, not yet purchased		32,998	41,048
Other investments, sold not yet purchased		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bonds and Redeemable Preferred Stock [Member]
Investments-trading		45,519	36,388
Total other investments, at fair value		476	476
Investment securities sold, not yet purchased		32,574	29,206
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government Bonds [Member]
Investments-trading		467	659
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Investments-trading		18,841	19,400
Investment securities sold, not yet purchased			20
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Investments-trading		169	70
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative [Member]
Investments-trading		1,275	13,717
Investment securities sold, not yet purchased		424	11,822
Other investments, sold not yet purchased			0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Investments-trading		1,118	428
Total other investments, at fair value		0	0
Investment securities sold, not yet purchased		0	0
Other investments, sold not yet purchased			0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Restricted Equity Securities [Member]
Total other investments, at fair value		19,449	34,172
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debt [Member]
Total other investments, at fair value			1,519
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Transition Loans [Member]
Total other investments, at fair value			2,300
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investments-trading		0	0
Investment securities sold, not yet purchased		0	0
Other investments, sold not yet purchased		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Bonds and Redeemable Preferred Stock [Member]
Investments-trading		0	0
Total other investments, at fair value		0	0
Investment securities sold, not yet purchased		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government Bonds [Member]
Investments-trading		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member]
Investments-trading		0	0
Investment securities sold, not yet purchased			0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member]
Investments-trading		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]
Investments-trading		0	0
Investment securities sold, not yet purchased		0	0
Other investments, sold not yet purchased			0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Investments-trading		0	0
Total other investments, at fair value		0	0
Investment securities sold, not yet purchased		0	0
Other investments, sold not yet purchased			0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Restricted Equity Securities [Member]
Total other investments, at fair value		0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Subordinated Debt [Member]
Total other investments, at fair value			0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential Transition Loans [Member]
Total other investments, at fair value			0
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Total other investments, at fair value	[1]	11,260	2,548
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member]
Investments-trading		134,093	162,031
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investments-trading		0	0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investments-trading		134,093	162,031
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investments-trading		0	0
US Government Agencies Debt Securities [Member]
Investment securities sold, not yet purchased		1	0
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member]
Investments-trading		22,373	6,904
Investment securities sold, not yet purchased		1
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investments-trading		0	0
Investment securities sold, not yet purchased		1
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investments-trading		22,373	6,904
Investment securities sold, not yet purchased		0
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investments-trading		0	0
Investment securities sold, not yet purchased		0
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Investments-trading		9	14
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investments-trading		0	0
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investments-trading		9	14
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investments-trading		0	0
Asset-backed Securities [Member] | Fair Value, Recurring [Member]
Investments-trading		1	1
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investments-trading		0	0
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investments-trading		1	1
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investments-trading		0	0
US Treasury Securities [Member]
Investment securities sold, not yet purchased		29,513	3,348
US Treasury Securities [Member] | Fair Value, Recurring [Member]
Investments-trading		29,513	607
Investment securities sold, not yet purchased			3,348
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investments-trading		29,513	607
Investment securities sold, not yet purchased			3,348
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investments-trading		0	0
Investment securities sold, not yet purchased			0
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investments-trading		0	0
Investment securities sold, not yet purchased			0
Small Business Administration Loans [Member] | Fair Value, Recurring [Member]
Investments-trading			2,742
Small Business Administration Loans [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investments-trading			0
Small Business Administration Loans [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investments-trading			2,742
Small Business Administration Loans [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investments-trading			0
Residential Mortgage [Member]
Total other investments, at fair value		115	104
Residential Mortgage [Member] | Fair Value, Recurring [Member]
Total other investments, at fair value		115	104
Residential Mortgage [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total other investments, at fair value		0	0
Residential Mortgage [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total other investments, at fair value		115	104
Residential Mortgage [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total other investments, at fair value		0	0
Total Investments not Measured at NAV [Member] | Fair Value, Recurring [Member]
Total other investments, at fair value		44,773	55,992
Total Investments not Measured at NAV [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total other investments, at fair value		24,733	17,421
Total Investments not Measured at NAV [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total other investments, at fair value		20,040	38,571
Total Investments not Measured at NAV [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total other investments, at fair value		$ 0	$ 0
[1] As a practical expedient, the Company uses NAV per share (or its equivalent) to measure the fair value of its investments in the U.S. Insurance JV and the SPAC Fund. The U.S. Insurance JV invests in USD denominated debt issued by small insurance and reinsurance companies. The SPAC Fund invests in equity securities of SPACs. According to ASC 820, these investments are not categorized within the valuation hierarchy.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 35
-Paragraph 1
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 210
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