Note 5 - Loans - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Commercial Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Interest income recognized	$ 6		$ 12
Commercial Portfolio Segment [Member]
Average recorded investment	2,835	$ 3,509	2,525	$ 4,436
Interest income recognized	4	8	4	21
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Average recorded investment	2,016	7,722	2,018	8,213
Interest income recognized	12	12	24	25
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Average recorded investment	1,401	2,284	1,425	2,289
Interest income recognized		19		38
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Average recorded investment	1,761	1,703	1,757	1,846
Interest income recognized
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Average recorded investment	1,895	771	1,507	773
Interest income recognized	7	7	13	14
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member]
Average recorded investment	9,123	9,798	9,141	9,921
Interest income recognized	41	34	82	66
Consumer Portfolio Segment [Member]
Average recorded investment	109	34	71	34
Interest income recognized
Average recorded investment	19,140	25,821	18,444	27,512
Interest income recognized	$ 70	$ 80	$ 135	$ 164