Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	$ 25,299	$ 36,119	$ 46,271
Interest income recognized	298	423	479
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	3,533	6,222	7,239
Interest income recognized	22	33	82
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	7,306	11,277	16,277
Interest income recognized	49	165	185
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	2,212	5,233	7,909
Interest income recognized	59	78	106
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	750	1,141	875
Interest income recognized	27	33	26
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	9,679	10,668	12,278
Interest income recognized	141	114	80
Residential Portfolio Segment [Member] | Mortgage Receivable [Member] | Real Estate Loan [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Average recorded investment	1,786	1,561	$ 1,693
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	$ 33	$ 17