Note 7 - Average Balance and Interest Income Recognized Related to Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Commercial Portfolio Segment [Member]
Loans, average recorded investment	$ 14,940	$ 25,620	$ 13,805	$ 25,523
Loans, interest income recognized	167	201	370	412
Real Estate Construction Portfolio Segment [Member]
Loans, average recorded investment	9,923	20,790	15,107	21,884
Loans, interest income recognized		65		130
Commercial Real Estate Portfolio Segment [Member]
Loans, average recorded investment	90,971	105,815	89,212	108,042
Loans, interest income recognized	713	793	1,513	1,574
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans, average recorded investment	17,112	17,025	17,052	17,152
Loans, interest income recognized	140	120	285	240
Loans, average recorded investment	132,946	169,250	135,176	172,601
Loans, interest income recognized	$ 1,020	$ 1,179	$ 2,168	$ 2,356