Note 20 - Condensed Financial Statements of Parent Company - Statements of Comprehensive Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Noninterest expense
Income before income taxes	$ 2,329,019	$ 1,123,537
Provision (benefit) for income taxes	1,968,428	(4,171,590)
Net income	360,591	5,295,127
Other comprehensive income (loss)
Unrealized income (loss) on available-for-sale securities	89,171	(147,390)
COMPREHENSIVE INCOME	449,762	5,147,737
Parent Company [Member]
Interest income on ESOP note receivable	66,111	21,924
Noninterest income
Equity in income of subsidiary	643,113	4,847,989
Noninterest expense
Professional fees and other	193,828	20,355
Income before income taxes	515,396	4,849,558
Provision (benefit) for income taxes	154,805	(445,569)
Net income	360,591	5,295,127
Other comprehensive income (loss)
Unrealized income (loss) on available-for-sale securities	89,171	(147,390)
COMPREHENSIVE INCOME	$ 449,762	$ 5,147,737