Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	$ 24,108	$ 35,218	$ 26,378	$ 37,344
Interest income recognized	69	82	233	336
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	2,885	6,511	3,919	5,848
Interest income recognized		13	22	15
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	6,874	10,055	7,767	11,948
Interest income recognized	12	11	37	155
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	2,281	5,271	2,286	6,112
Interest income recognized	15	20	52	58
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	742	1,155	763	1,238
Interest income recognized	6	8	20	25
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [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	9,616		9,819
Interest income recognized	36		102
Residential Portfolio Segment [Member] | Mortgage Receivable [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	1,677	12,197	1,790	12,179
Interest income recognized		30		83
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	$ 33	$ 29	$ 34	$ 19