Note 21 - Condensed Financial Statements of Parent Company - Statements of Cash Flows (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net income	$ 710,179	$ 1,073,514
Changes in operating assets and liabilities:
Prepaid and other assets	(79,725)	325,921
Accrued interest and other liabilities	267,256	(154,044)
Net cash provided by (used for) operating activities	31,989,691	(7,237,752)
Cash flows from investing activities
Net cash provided by investing activities	(22,666,935)	(36,681,748)
Cash flows from financing activities
Stock dividends on financial institution stock	(106,400)	(84,500)
Stock option exercise	70,035	149,228
Share repurchase	2,732,648	1,926,720
Dividends paid	481,822	4,161,114
Net cash provided by financing activities	8,389,252	45,820,779
Net increase (decrease) in cash and due from banks	17,712,008	1,901,279
Cash and cash equivalents, beginning of period	11,774,457	9,873,178
Cash and cash equivalents, end of period	29,486,465	11,774,457
Parent Company [Member]
Cash flows from operating activities
Net income	710,179	1,073,514
Adjustments to reconcile net income to net cash from operating activities:
Equity in (income) of subsidiary	(795,761)	(1,100,091)
Changes in operating assets and liabilities:
Prepaid and other assets	164,100	(325,408)
Accrued interest and other liabilities	5,000	(35,828)
Net cash provided by (used for) operating activities	83,518	(387,813)
Cash flows from investing activities
Principal collections on ESOP note receivable	28,189	30,699
Net cash provided by investing activities	28,189	30,699
Cash flows from financing activities
Stock dividends on financial institution stock		4,800,000
Stock option exercise	70,058	149,228
Share repurchase	(2,732,648)	(1,926,720)
Dividends paid	(481,822)	(4,161,114)
Net cash provided by financing activities	(3,144,412)	(1,138,606)
Net increase (decrease) in cash and due from banks	(3,032,705)	(1,495,720)
Cash and cash equivalents, beginning of period	4,993,568	6,489,288
Cash and cash equivalents, end of period	$ 1,960,863	$ 4,993,568