Note 15 - Parent Company Financial Information - Balance Sheets (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets	$ 442,215,098	$ 417,157,877
Common stock, par value $.01 per share, authorized 5,000,000 shares; issued and outstanding 2,974,019 shares in 2019 and 1,682,997 shares in 2018	29,740	16,830
Additional paid-in capital	27,812,991	27,324,794
Retained earnings	21,568,161	18,621,382
Accumulated other comprehensive income (loss)	42,624	(568,299)
Stockholders' Equity Attributable to Parent	49,453,516	45,394,707	$ 41,798,932
Liabilities and Equity	442,215,098	417,157,877
Parent Company [Member]
Cash and cash equivalents	64,152	64,243
Investment in subsidiaries	49,389,364	45,330,464
Assets	49,453,516	45,394,707
Common stock, par value $.01 per share, authorized 5,000,000 shares; issued and outstanding 2,974,019 shares in 2019 and 1,682,997 shares in 2018	29,740	16,830
Additional paid-in capital	27,812,991	27,324,794
Retained earnings	21,568,161	18,621,382
Accumulated other comprehensive income (loss)	42,624	(568,299)
Stockholders' Equity Attributable to Parent	49,453,516	45,394,707
Liabilities and Equity	$ 49,453,516	$ 45,394,707