Note 20 - Condensed Financial Statements of Parent Company - Balance Sheets (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 4,988,178	$ 4,766,344
Prepaid and other assets	1,294,606	776,477
TOTAL ASSETS	336,220,518	328,867,198
Liabilities
Total liabilities	285,249,829	278,090,621
LIABILITIES AND STOCKHOLDERS’ EQUITY
Common stock, $0.01 par value, 100,000,000 authorized, 3,490,672 and 3,438,190 issued and outstanding, respectively	34,907	34,382
Additional paid-in capital	26,849,822	27,161,856
Retained earnings	26,060,598	25,700,007
Accumulated other comprehensive loss, net of tax	(274,266)	(363,437)
Unearned employee stock ownership plan (ESOP) shares	(1,700,372)	(1,756,231)
Total stockholders’ equity	50,970,689	50,776,577	$ 29,643,724
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	336,220,518	328,867,198
Parent Company [Member]
ASSETS
Cash and due from banks	6,489,288	6,978,326
Investment in wholly owned subsidiary	42,426,774	41,591,052
ESOP note receivable	1,731,494	1,761,628
Prepaid and other assets	358,962	445,701
TOTAL ASSETS	51,006,518	50,776,707
Liabilities
Income taxes payable	0	130
Accounts payable	35,829	0
Total liabilities	35,829	130
LIABILITIES AND STOCKHOLDERS’ EQUITY
Common stock, $0.01 par value, 100,000,000 authorized, 3,490,672 and 3,438,190 issued and outstanding, respectively	34,907	34,382
Additional paid-in capital	26,849,822	27,161,856
Retained earnings	26,060,598	25,700,007
Accumulated other comprehensive loss, net of tax	(274,266)	(363,437)
Unearned employee stock ownership plan (ESOP) shares	(1,700,372)	(1,756,231)
Total stockholders’ equity	50,970,689	50,776,577
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 51,006,518	$ 50,776,707