Represents the percentage of entity's interest in net assets of the subsidiary measured at fair value.

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The carrying amount of assets an investment adviser manages on behalf of investors.

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Amount of investment in equity security without readily determinable fair value.

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Cost of the investment.

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Balance held at close of period in number of shares.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Amount, after allowance for credit loss, of financing receivable, classified as noncurrent.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of cash outflow to acquire investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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Note 1 - Organization and Significant Accounting Policies (Details Textual)		6 Months Ended	12 Months Ended
	Sep. 08, 2022 USD ($)	Dec. 31, 2022 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)
Number of Reportable Segments				4
Investment Owned, at Cost		$ 450,000	$ 450,000	$ 450,000	$ 0
Payments to Acquire Investments, Total			3,595,599		$ 2,265,088
Crossing Bridge Advisor LLC [Member]
Investments, Fair Value Disclosure, Total		300,025	300,025	300,025
Triad Guaranty, Inc. [Member]
Financing Receivable, after Allowance for Credit Loss, Noncurrent, Total		$ 50,000	$ 50,000	$ 50,000
Investment Owned, Balance, Shares (in shares) \| shares		847,847	847,847	847,847
Equity Securities without Readily Determinable Fair Value, Amount		$ 0	$ 0	$ 0
Mutual Fund [Member] \| Crossing Bridge Advisor LLC [Member]
Payments to Acquire Investments, Total		4,500,000
Minimum [Member] \| Triad Guaranty, Inc. [Member]
Percentage of Annual Interest Rate on Promissory Note			12.00%
Maximum [Member] \| Triad Guaranty, Inc. [Member]
Percentage of Annual Interest Rate on Promissory Note			18.00%
Crossing Bridge Advisor LLC [Member] \| Minimum [Member]
Assets under Management, Carrying Amount		1.2	$ 1.2	1.2
eBuild Ventures, LLC [Member] \| Start-up Phase Private Company [Member]
Payments to Acquire Equity Securities, FV-NI	$ 450,000
Investment Ownership Percentage	10.00%
Investment Owned, at Cost		$ 450,000	$ 450,000	$ 450,000