Note 2 - Investments (Details Textual)	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Nov. 30, 2021 USD ($)
Debt Securities, Available-for-Sale, Total	$ 93,388,971	$ 105,841,543
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,945,837	90,008
Other-than-temporary Impairment Loss, Debt Securities, Available-for-Sale, Recognized in Earnings	0	0
Other Investments, Total	$ 4,722,137	3,086,568
Number Of Storage Facilities	1
Number of Apartment Rental Units	58
Real Estate Investment Property, Accumulated Depreciation	$ 609,282	464,713
Depreciation, Nonproduction	169,199	145,237
Notes Receivable [Member]
Other Investments, Total	4,082,507	2,682,368
Privately Held Investments [Member]
Other Investments, Total	214,630	104,200
Notes Issued on July 30, 2019 [Member]
Debt Instrument Accumulated Payments Received	244,046	315,077
Increase (Decrease) in Accrued Interest Receivable, Net	10,496	12,075
Financing Receivable, Allowance for Credit Loss, Ending Balance	$ 0	0
Notes Issued on July 30, 2019 [Member] | Prime Rate [Member]
Loans Receivable, Basis Spread on Variable Rate	0.25%
Notes Issued on July 30, 2019 [Member] | Minimum [Member]
Financing Receivable, Interest Rate	3.90%
Notes Issued on July 30, 2019 [Member] | Minimum [Member] | Prime Rate [Member]
Loans Receivable, Basis Spread on Variable Rate	4.00%
Notes Issued on July 30, 2019 [Member] | Maximum [Member]
Financing Receivable, Interest Rate	7.25%
Private Investment Fund [Member]
Other Investments, Total		10,000,000.0	$ 10,000,000.0
Federal Home Loan Bank of Chicago [Member]
Other Investments, Total	$ 425,000	300,000
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Total	19,288,540	14,975,101
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Total	$ 8,946,897	11,697,671
Fixed Income Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	236
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	45
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 3,945,837
Held-To-Maturity Securities, Amount On Deposit With Regulatory Authorities Or Banks	3,290,386	3,823,752
Equity Securities [Member]
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	$ 4,706,405
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain		$ 2,801,991