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Note 16 - Related Party Transactions (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2026	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Jan. 16, 2026	Dec. 31, 2025	May 20, 2025	Dec. 31, 2024
Interest and Dividend Income, Operating		$ 278,000	$ 334,000	$ 586,000	$ 372,000
Equity, Attributable to Noncontrolling Interest		50,000		50,000			$ 0
Management Fee Income		310,000	103,000	574,000	180,000
Contract with Customer, Liability		7,760,000		7,760,000			4,504,000
Underwriting Income (Loss)		7,902,000	19,858,000	40,851,000	25,770,000
Carried Interest Income		1,551,000	10,500,000	2,647,000	10,500,000
Brokerage Commissions Revenue		$ 6,567,000	5,834,000	$ 9,057,000	7,848,000
AV Manager and AV Investment Manager [Member]
Subsidiary, Ownership Percentage, Parent		90.00%		90.00%
Subsidiary, Ownership Percentage, Noncontrolling Owner		10.00%		10.00%
Equity, Attributable to Noncontrolling Interest		$ 150,000		$ 150,000
Accounts Payable		$ 50,000		$ 50,000
American VO Manager LLC [Member]
Investor Ownership Percentage		65.00%		65.00%
Subsidiary, Ownership Percentage, Parent		65.00%		65.00%		65.00%
Subsidiary, Ownership Percentage, Noncontrolling Owner		35.00%		35.00%
American VO IM LLC [Member]
Investor Ownership Percentage		65.00%		65.00%
Subsidiary, Ownership Percentage, Parent		65.00%		65.00%		65.00%
Subsidiary, Ownership Percentage, Noncontrolling Owner		35.00%		35.00%
Chief Executive Officer [Member] \| Underwriter Transactions with Revere [Member]
Related Party Transaction, Amounts of Transaction					368,000
Chief Executive Officer [Member] \| Underwriter Transactions with Revere [Member] \| Revere [Member]
Investor Ownership Percentage								30.00%
Related Party [Member] \| Employee Loans [Member]
Receivable with Imputed Interest, Net Amount		$ 1,500,000	$ 2,000,000	$ 1,500,000	2,000,000				$ 2,400,000
Receivable with Imputed Interest, Effective Yield (Interest Rate)				3.20%
Interest and Dividend Income, Operating				$ 33,000	21,000
Related Party [Member] \| Employee Loans [Member] \| Minimum [Member]
Receivable with Imputed Interest, Term (Year)				3 years
Related Party [Member] \| Employee Loans [Member] \| Maximum [Member]
Receivable with Imputed Interest, Term (Year)				7 years
Related Party Special Purpose Vehicles [Member]
Management Fee Income				$ 600,000	$ 200,000
Contract with Customer, Liability		$ 7,800,000		7,800,000			$ 4,500,000
Underwriting Income (Loss)				15,900,000
Carried Interest Income				2,600,000
Brokerage Commissions Revenue				$ 6,300,000
Kyle Wool [Member] \| New America Acquisition I Corp [Member]
Proceeds from Sale of Equity Method Investments	$ 270,000
Equity Method Investment, Realized Gain (Loss) on Disposal	67,000
Kyle Wool [Member] \| Datacentrex, Inc. [Member]
Proceeds from Sale of Equity Method Investments	350,000
Equity Method Investment, Realized Gain (Loss) on Disposal	$ 350,000
Kyle Wool [Member] \| New America Acquisition I Corp [Member]
Equity Method Investment, Shares Sold (in shares)	134,750
Kyle Wool [Member] \| Datacentrex, Inc. [Member]
Equity Method Investment, Shares Sold (in shares)	200,000