Note 2 - Investments (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale, Total	$ 103,318,485		$ 103,318,485		$ 92,087,572
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	22		22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	4		4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 22,560		$ 22,560		31,679
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings			0
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	981,779	$ (7,603)	2,195	$ 1,716,124
Other Investments, Total	305,000		305,000
Notes Issued on July 30, 2019 [Member]
Financing Receivable, after Allowance for Credit Loss, Total	625,000		$ 625,000
Financing Receivable, Interest Rate			6.50%
Financing Receivable, Amortization Period (Year)			20 years
Notes Issued on January 28, 2020 [Member]
Financing Receivable, after Allowance for Credit Loss, Total	650,000		$ 650,000
Financing Receivable, Interest Rate			6.50%
Financing Receivable, Amortization Period (Year)			20 years
Federal Home Loan Bank of Chicago [Member]
Federal Home Loan Bank Advances, Total	200,000		$ 200,000
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Total	13,590,690		13,590,690		9,909,462
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Total	$ 13,811,945		$ 13,811,945		$ 13,408,898