Note 13 - Condensed Financial Statements of Parent Company (Details) - Condensed Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash due from subsidiaries	$ 12,152	$ 12,894	$ 13,283	$ 14,783
Interest-bearing deposits	130,811	102,548
Securities available for sale	236,131	222,844
Securities held to maturity (fair value approximates $449 at December 31, 2015 and $450 at December 31, 2014)	152,028	161,452
Other assets	8,564	7,767
Total assets	1,199,739	1,154,731
Liabilities and Stockholders’ Equity
Other liabilities	8,710	5,932
Stockholders’ equity	172,114	166,303	$ 145,892	$ 150,109
Total liabilities and stockholders’ equity	1,199,739	1,154,731
Parent Company [Member]
Assets
Cash due from subsidiaries	19	10
Interest-bearing deposits	170	477
Securities available for sale	127	127
Securities held to maturity (fair value approximates $449 at December 31, 2015 and $450 at December 31, 2014)	451	452
Investments in subsidiaries, at equity	172,017	165,647
Other assets	56	188
Total assets	172,840	166,901
Liabilities and Stockholders’ Equity
Other liabilities	726	598
Stockholders’ equity	172,114	166,303
Total liabilities and stockholders’ equity	$ 172,840	$ 166,901