Note 3 - Investment Securities (Details) - Investment Securities by Contractual Maturity - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Note 3 - Investment Securities (Details) - Investment Securities by Contractual Maturity [Line Items]
Due in 1 year or less	$ 7,444
Due in 1 year or less	7,505
Due in 1 year or less	0
Due in 1 year or less	0
After 1 year to 5 years	13,617
After 1 year to 5 years	13,730
After 1 year to 5 years	5,070
After 1 year to 5 years	5,021
After 5 years to 10 years	50,645
After 5 years to 10 years	49,089
After 5 years to 10 years	13,017
After 5 years to 10 years	13,033
After 10 years	26,218
After 10 years	26,155
After 10 years	0
After 10 years	0
Total	288,792
Total	284,795
Total	172,277	$ 67,866
Total	171,845	68,253
Collateralized Mortgage Obligations [Member]
Note 3 - Investment Securities (Details) - Investment Securities by Contractual Maturity [Line Items]
Available for Sale, No Specific Maturity Date, Amortized Cost	180,795
Available for Sale, No Specific Maturity Date, Fair Value	178,145
Held to Maturity, No Specific Maturity Date, Amortized Cost	146,458
Held to Maturity, No Specific Maturity Date, Fair Value	146,080
Total	146,458	67,845
Total	146,080	$ 68,232
Collateralized Mortgage Backed Securities [Member]
Note 3 - Investment Securities (Details) - Investment Securities by Contractual Maturity [Line Items]
Available for Sale, No Specific Maturity Date, Amortized Cost	10,073
Available for Sale, No Specific Maturity Date, Fair Value	10,171
Held to Maturity, No Specific Maturity Date, Amortized Cost	7,732
Held to Maturity, No Specific Maturity Date, Fair Value	7,711
Total	7,732
Total	$ 7,711