Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	$ 25,821	$ 36,172	$ 27,512	$ 39,402
Interest income recognized	80	113	164	254
Commercial Portfolio Segment [Member]
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	3,509	4,295	4,436	6,114
Interest income recognized	8		21	1
Commercial Real Estate Portfolio Segment [Member] | Other Loan [Member]
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	10,006	18,402	10,502	19,806
Interest income recognized	31	77	63	184
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	11,501	12,136	11,767	12,214
Interest income recognized	34	28	66	52
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	771	1,310	773	1,268
Interest income recognized	7	8	14	$ 17
Consumer Portfolio Segment [Member]
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	$ 34	$ 29	$ 34