Note 5 - Investment Securities (Details) - Investment Securities by Contractual Maturity - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Note 5 - Investment Securities (Details) - Investment Securities by Contractual Maturity [Line Items]
Due in 1 year or less	$ 6,844
Due in 1 year or less	6,883
Due in 1 year or less	0
Due in 1 year or less	0
After 1 year to 5 years	13,596
After 1 year to 5 years	13,686
After 1 year to 5 years	4,833
After 1 year to 5 years	4,822
After 5 years to 10 years	51,741
After 5 years to 10 years	50,051
After 5 years to 10 years	12,992
After 5 years to 10 years	13,147
After 10 years	25,612
After 10 years	24,590
After 10 years	0
After 10 years	0
Total	261,249
Total	260,269
Total	178,628	$ 172,277
Total	181,306	171,845
Collateralized Mortgage Obligations [Member]
Note 5 - Investment Securities (Details) - Investment Securities by Contractual Maturity [Line Items]
Available for Sale, No Specific Maturity Date, Amortized Cost	153,524
Available for Sale, No Specific Maturity Date, Fair Value	155,097
Held to Maturity, No Specific Maturity Date, Amortized Cost	142,760
Held to Maturity, No Specific Maturity Date, Fair Value	145,167
Total	142,760	146,458
Total	145,167	146,080
Collateralized Mortgage Backed Securities [Member]
Note 5 - Investment Securities (Details) - Investment Securities by Contractual Maturity [Line Items]
Available for Sale, No Specific Maturity Date, Amortized Cost	9,932
Available for Sale, No Specific Maturity Date, Fair Value	9,962
Held to Maturity, No Specific Maturity Date, Amortized Cost	18,043
Held to Maturity, No Specific Maturity Date, Fair Value	18,170
Total	18,043	7,732
Total	$ 18,170	$ 7,711