Note 7 - Investment Securities by Contractual Maturity (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Due in one year or less	$ 5,371,000
Due in one year or less	5,292,000
Due after one year through five years	220,326,000
Due after one year through five years	217,024,000
Due after five years through ten years	97,106,000
Due after five years through ten years	95,501,000
Due after ten years	13,677,000
Due after ten years	14,067,000
Equity securities	7,773,000
Equity securities	7,711,000
Available-for-sale Securities	344,253,000	$ 361,915,000
Available-for-sale, amortized cost	339,595,000	362,742,000
Due in one year or less	149,000
Due in one year or less	147,000
Due after one year through five years	0
Due after one year through five years	0
Due after five years through ten years	0
Due after five years through ten years	0
Due after ten years	0
Due after ten years	0
Total investment securities held-to-maturity	149,000	151,000
Total investment securities held-to-maturity	$ 147,000	$ 147,000