Note 5 - Investment Securities Available-for-sale (Details) - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Note 5 - Investment Securities Available-for-sale (Details) - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale [Line Items]
Investment securities available for sale, due in one year or less, amortized cost	$ 4,605
Investment securities available for sale, due in one year or less, fair value	4,460
Investment securities available for sale, due after one year through five years, amortized cost	85,337
Investment securities available for sale, due after one year through five years, fair value	85,752
Investment securities available for sale, due after five years through ten years, amortized cost	95,713
Investment securities available for sale, due after five years through ten years, fair value	95,187
Investment securities available for sale, due after ten years, amortized cost	17,731
Investment securities available for sale, due after ten years, fair value	17,649
Investment securities available for sale, amortized cost	203,386
Investment securities available for sale, fair value	203,048	$ 211,511
US Government Agencies Debt Securities [Member]
Note 5 - Investment Securities Available-for-sale (Details) - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale [Line Items]
Investment securities available for sale, due after one year through five years, amortized cost	2,013
Investment securities available for sale, due after one year through five years, fair value	2,034
Investment securities available for sale, due after five years through ten years, amortized cost	1,147
Investment securities available for sale, due after five years through ten years, fair value	1,169
Investment securities available for sale, amortized cost	3,160
Investment securities available for sale, fair value	3,203	3,965
US States and Political Subdivisions Debt Securities [Member]
Note 5 - Investment Securities Available-for-sale (Details) - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale [Line Items]
Investment securities available for sale, due in one year or less, amortized cost	301
Investment securities available for sale, due in one year or less, fair value	302
Investment securities available for sale, due after one year through five years, amortized cost	2,703
Investment securities available for sale, due after one year through five years, fair value	2,728
Investment securities available for sale, due after five years through ten years, amortized cost	3,532
Investment securities available for sale, due after five years through ten years, fair value	3,447
Investment securities available for sale, amortized cost	6,536
Investment securities available for sale, fair value	6,477	6,732
Collateralized Mortgage Obligations (Federal Agencies) [Member]
Note 5 - Investment Securities Available-for-sale (Details) - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale [Line Items]
Investment securities available for sale, due in one year or less, amortized cost	4,304
Investment securities available for sale, due in one year or less, fair value	4,158
Investment securities available for sale, due after one year through five years, amortized cost	16,441
Investment securities available for sale, due after one year through five years, fair value	16,280
Investment securities available for sale, due after five years through ten years, amortized cost	66,776
Investment securities available for sale, due after five years through ten years, fair value	66,275
Investment securities available for sale, amortized cost	87,521
Investment securities available for sale, fair value	86,713	87,774
Other Mortgage-Backed (Federal Agencies) [Member]
Note 5 - Investment Securities Available-for-sale (Details) - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale [Line Items]
Investment securities available for sale, due after one year through five years, amortized cost	37,324
Investment securities available for sale, due after one year through five years, fair value	37,680
Investment securities available for sale, due after five years through ten years, amortized cost	20,590
Investment securities available for sale, due after five years through ten years, fair value	20,629
Investment securities available for sale, due after ten years, amortized cost	17,731
Investment securities available for sale, due after ten years, fair value	17,649
Investment securities available for sale, amortized cost	75,645
Investment securities available for sale, fair value	75,958	78,503
SBA Loan-Backed (Federal Agencies) [Member]
Note 5 - Investment Securities Available-for-sale (Details) - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale [Line Items]
Investment securities available for sale, due after one year through five years, amortized cost	26,856
Investment securities available for sale, due after one year through five years, fair value	27,030
Investment securities available for sale, due after five years through ten years, amortized cost	3,668
Investment securities available for sale, due after five years through ten years, fair value	3,667
Investment securities available for sale, amortized cost	30,524
Investment securities available for sale, fair value	$ 30,697	$ 34,537