Note 2 - Investments - Valuation Allowance on Commercial Loan Portfolio (Details) - USD ($)	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Change in provision for credit losses	$ (0)	$ (13,225)
Real Estate Loan [Member]
Change in provision for credit losses	(0)	(13,225)
Real Estate Loan [Member] \| Specific Allowance [Member]
Beginning allowance balance	0
Charge-offs	0
Recoveries	0
Change in provision for credit losses	0
Ending Allowance	0
Real Estate Loan [Member] \| Specific Allowance [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning allowance balance	$ 0
Real Estate Loan [Member] \| General Allowance [Member]
Beginning allowance balance		21,644
Charge-offs		0
Recoveries		0
Change in provision for credit losses		0
Ending Allowance		21,644
Real Estate Loan [Member] \| General Allowance [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning allowance balance		$ 0

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
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-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
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-Section 1405
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-02(4))
-Publisher FASB
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(2))
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant