Note 14 - Income Taxes - Deferred Taxes (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowances for loan losses	$ 1,825,853	$ 1,679,069
Writedowns on foreclosed assets held for sale	409,031	208,434
Unrealized loss on interest rate swaps	390,804
Deferred loan fees/costs	96,700	130,011
Unrealized loss on available-for-sale securities		468,298
Other purchase accounting adjustments	690,341	692,849
Tax credit partnerships and related tax credit carryforwards	1,354,315	1,543,723
Other	284,925	75,714
	5,051,969	4,798,098
Deferred tax liabilities:
FHLB stock dividends	(30,062)	(31,941)
Unrealized gain on interest rate swaps		(324,242)
Unrealized gain on available-for-sale securities	(262,217)
Accumulated depreciation	(598,785)	(704,543)
Other	(749,964)	(86,819)
	(1,641,028)	(1,147,545)
Net deferred tax asset	$ 3,410,941	$ 3,650,553