Note 7 - Loans - Average Balance and Interest Income Recognized Related to Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commercial Portfolio Segment [Member]
Loans, average recorded investment	$ 28,091	$ 23,894	$ 18,602	$ 24,974
Loans, interest income recognized	170	170	488	519
Real Estate Construction Portfolio Segment [Member]
Loans, average recorded investment	5,869	22,392	12,005	22,056
Loans, interest income recognized	66	66	196	196
Commercial Real Estate Portfolio Segment [Member]
Loans, average recorded investment	81,005	97,557	86,456	104,508
Loans, interest income recognized	776	777	2,124	2,126
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans, average recorded investment	18,256	16,506	17,456	16,934
Loans, interest income recognized	148	139	401	380
Loans, average recorded investment	133,221	160,349	134,519	168,472
Loans, interest income recognized	$ 1,160	$ 1,152	$ 3,209	$ 3,221