Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	Sep. 30, 2023	Jun. 30, 2023	Jan. 01, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss	$ 12,348,125	$ 12,283,325		$ 11,177,753	$ 11,298,845	$ 11,197,954	$ 11,087,164
Off-Balance-Sheet, Credit Loss, Liability	173,100,000
Retained Earnings (Accumulated Deficit)	107,857,990			104,129,261
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss	946,000
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	0			0
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	$ 2,900,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss				$ 784,194
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss			$ 784,000
Off-Balance-Sheet, Credit Loss, Liability			1,200,000
Retained Earnings (Accumulated Deficit)			$ (1,600,000)