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Note 8 - Federal Income Tax (Details Textual) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Federal Excise Tax, Percent	4.00%
Operating Loss Carryforwards	$ 38.4	$ 38.6
Sales and Excise Tax Payable	1.5	1.5
Investment, Tax Basis, Cost	766.8	759.2
Investment, Tax Basis, Unrealized Gain	14.8	14.9
Investment, Tax Basis, Unrealized Loss	$ 83.7	$ 65.0

X

- Definition

The federal excise tax percent.

+ References

No definition available.

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X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-3

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Carrying value as of the balance sheet date of liabilities incurred through that date and payable for statutory sales and use taxes, including value added tax.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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-Publisher FASB
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Amount of cost of investment for federal income tax purpose.

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-Topic 946
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
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Amount of cumulative increase in investment from unrealized gain when value exceeds cost for federal income tax purpose.

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-Topic 946
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
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Amount of cumulative decrease in investment from unrealized loss when cost for federal income tax purpose exceeds value.

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