Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	$ 17,747	$ 29,204
Interest income recognized	65	92
Commercial Portfolio Segment [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	2,215	5,363
Interest income recognized	1	20
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	2,020	8,705
Interest income recognized	12	13
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	1,449	2,292
Interest income recognized	6	19
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	9,158	10,045
Interest income recognized	40	33
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	1,753	1,988
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	1,120	776
Interest income recognized	6	7
Consumer Portfolio Segment [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	$ 32	$ 35