Note 16 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for loan losses	$ 734,048	$ 721,765
Unrealized losses on AFS securities		135,038
Board of Directors retirement plan	271,099	239,957
Other, net	278,581	311,762
Deferred compensation	248,271	215,033
Accrued bonus	192,331	216,254
Organizational costs	50,451	70,638
Net operating loss carryforwards	787,500	840,001
Total deferred tax assets	2,562,281	2,750,448
Deferred tax liabilities:
FHLB stock dividends	(79,953)	(52,709)
Depreciation and amortization	(217,321)	(276,802)
Loan origination costs	(218,615)	(195,770)
Purchase accounting	(33,425)	(28,239)
Unrealized gains on AFS securities	(105,091)
Total deferred tax liabilities	(654,405)	(553,520)
Net deferred tax asset	$ 1,907,876	$ 2,196,928