Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	Jun. 30, 2023	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss	$ 12,283,325	$ 12,126,810		$ 11,177,753	$ 11,197,954	$ 11,128,963	$ 11,087,164
Off-Balance-Sheet, Credit Loss, Liability	176,100,000
Retained Earnings (Accumulated Deficit)	106,157,384			104,129,261
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss	729,000
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	$ 2,800,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss			$ 784,000	$ 784,194
Off-Balance-Sheet, Credit Loss, Liability			1,200,000
Retained Earnings (Accumulated Deficit)			$ (1,600,000)