Note 12 - Condensed Financial Statements of Parent Company - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income
Realized securities gains, net	$ 17	$ 14	$ 232
Other income	1,005	1,148	1,289
Expenses
Income before income tax benefit and equity in undistributed net income of subsidiaries	18,711	20,385	18,894
Applicable income tax benefit	2,560	6,293	3,952
Net income	16,151	14,092	14,942
Parent Company [Member]
Income
Dividends from subsidiaries	9,419	8,141	9,421
Interest on securities – taxable			2
Realized securities gains, net		4
Other income	10	1,018	987
Total income	9,429	9,163	10,410
Expenses
Other expenses	1,244	1,986	1,992
Income before income tax benefit and equity in undistributed net income of subsidiaries	8,185	7,177	8,418
Applicable income tax benefit	308	383	628
Income before equity in undistributed net income of subsidiaries	8,493	7,560	9,046
Equity in undistributed net income of subsidiaries	7,658	6,532	5,896
Net income	$ 16,151	$ 14,092	$ 14,942