Note 13 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($)	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Capital Expenditures	$ 379,206	$ 4,630,900
Capital Expenditures	379,206	4,630,900
Office Building [Member]
Capital Expenditures	379,206	360,708
Capital Expenditures	379,206	360,708
Operating Property [Member]
Capital Expenditures	0	4,270,192
Capital Expenditures	0	4,270,192
Office/Industrial Properties [Member] \| Operating Segments [Member] \| Office Building [Member]
Capital Expenditures	379,206	360,708
Capital Expenditures	379,206	360,708
Model Home Properties [Member] \| Operating Segments [Member] \| Model Home [Member]
Capital Expenditures	0	4,270,192
Capital Expenditures	$ 0	$ 4,270,192

Amount of expenditure for addition to long-lived asset included in determination of segment asset by chief operating decision maker (CODM) or otherwise regularly provided to CODM. Long-lived asset excludes financial instrument, long-term customer relationship of financial institution, mortgage and other servicing rights, deferred policy acquisition cost, and deferred tax asset.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Section 50
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 25
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-25

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
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-Section 55
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-URI https://asc.fasb.org/1943274/2147482785/280-10-55-48

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
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-Name Accounting Standards Codification
-Section 55
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
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