Note 20 - Condensed Financial Statements of Parent Company - Statements of Cash Flows (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income	$ 1,073,514	$ 360,591
Changes in operating assets and liabilities:
Prepaid and other assets	325,921	(638,832)
Net cash provided by (used for) operating activities	(7,237,752)	15,425,685
Cash flows from investing activities
Net cash provided by investing activities	(36,681,748)	(27,625,768)
Cash flows from financing activities
Stock dividend on financial institution stock	(84,500)	(53,600)
Stock option exercise	149,228	55,314
Share repurchase	1,926,720	414,400
Dividend paid - $1.25 per share	4,161,114
Net cash provided by financing activities	45,820,779	5,661,917
Net change in cash and cash equivalents	1,901,279	(6,538,166)
Cash and cash equivalents, beginning of period	9,873,178	16,411,344
Cash and cash equivalents, end of period	11,774,457	9,873,178
Parent Company [Member]
Cash flows from operating activities
Net income	1,073,514	360,591
Adjustments to reconcile net income to net cash from operating activities:
Equity in (income) of subsidiary	(1,100,091)	(643,113)
Changes in operating assets and liabilities:
Prepaid and other assets	(325,408)	86,609
Accounts payable	(35,829)	35,827
Net cash provided by (used for) operating activities	(387,813)	(160,086)
Cash flows from investing activities
Principal collections on ESOP note receivable	30,699	30,134
Net cash provided by investing activities	30,699	30,134
Cash flows from financing activities
Stock dividend on financial institution stock	4,800,000
Stock option exercise	149,228	55,314
Share repurchase	(1,926,720)	(414,400)
Dividend paid - $1.25 per share	(4,161,114)
Net cash provided by financing activities	(1,138,606)	(359,086)
Net change in cash and cash equivalents	(1,495,720)	(489,038)
Cash and cash equivalents, beginning of period	6,489,288	6,978,326
Cash and cash equivalents, end of period	$ 4,993,568	$ 6,489,288