Note 13 - Income Taxes - Deferred Taxes (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Allowances for loan losses	$ 1,679,069	$ 1,492,558
Writedowns on foreclosed assets held for sale	208,434	86,610
Deferred loan fees/costs	130,011	168,961
Unrealized depreciation on available-for-sale securities	468,298	215,317
Other purchase accounting adjustments	692,849
Tax credit partnerships and related tax credit carryforwards	1,543,723	445,151
Other	75,714	71,395
	4,798,098	2,479,992
Deferred tax liabilities:
FHLB stock dividends	(31,941)	(32,035)
Unrealized appreciation on interest rate swaps	(324,242)	(144,765)
Accumulated depreciation	(704,543)	(544,560)
Other	(86,819)	(31,458)
	(1,147,545)	(752,818)
Net deferred tax asset	$ 3,650,553	$ 1,727,174