Note 13 - Condensed Financial Statements of Parent Company - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 13,974	$ 12,152	$ 12,894	$ 13,283
Interest-bearing deposits	80,268	130,811
Securities available for sale, at fair value	304,282	236,131
Securities held to maturity (fair value approximates $449 at December 31, 2015)	134,957	152,028
Other assets	13,128	12,344
Total assets	1,233,942	1,203,519
Liabilities and Stockholders’ Equity
Other liabilities	12,182	12,490
Stockholders’ equity	178,263	172,114	$ 166,303	$ 145,892
Total liabilities and stockholders’ equity	1,233,942	1,203,519
Parent Company [Member]
Assets
Cash and due from banks	74	19
Interest-bearing deposits	1,310	170
Securities available for sale, at fair value	163	127
Securities held to maturity (fair value approximates $449 at December 31, 2015)	0	451
Investments in subsidiaries, at equity	177,150	172,017
Refundable income taxes	22	0
Other assets	561	575
Total assets	179,280	173,359
Liabilities and Stockholders’ Equity
Other liabilities	1,017	1,245
Stockholders’ equity	178,263	172,114
Total liabilities and stockholders’ equity	$ 179,280	$ 173,359