Note 12 - Condensed Financial Statements of Parent Company - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 12,882	$ 12,926	$ 13,974	$ 12,152
Interest-bearing deposits	43,491	51,233
Investments in subsidiaries	189,692	184,336
Other assets	14,585	16,454
Total assets	1,256,032	1,256,757
Liabilities and Stockholders’ Equity
Other liabilities	13,763	12,065
Stockholders’ equity	190,238	184,896	$ 178,263	$ 172,114
Total liabilities and stockholders’ equity	1,256,032	1,256,757
Parent Company [Member]
Assets
Cash and due from banks	44	46
Interest-bearing deposits	357	503
Refundable income taxes	396	168
Other assets	841	820
Total assets	191,330	185,873
Liabilities and Stockholders’ Equity
Other liabilities	1,092	977
Stockholders’ equity	190,238	184,896
Total liabilities and stockholders’ equity	$ 191,330	$ 185,873