Note 7 - Loans - Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Commercial Portfolio Segment [Member]
No. of Loans	7	2	11	3
Pre-Modification Recorded Investment	$ 18,258	$ 306	$ 23,102	$ 1,156
Post-Modification Recorded Investment	18,258	306	23,102	1,156
Charge-offs
Special Reserve	$ 208	$ 1	$ 222	$ 1
Commercial Real Estate Portfolio Segment [Member]
No. of Loans	1	15	1	19
Pre-Modification Recorded Investment	$ 738	$ 1,918	$ 738	$ 16,329
Post-Modification Recorded Investment	738	1,918	738	16,329
Charge-offs
Special Reserve				$ 38
Residential Mortgage and Equity Lines Portfolio Segment [Member]
No. of Loans			2	5
Pre-Modification Recorded Investment			$ 367	$ 1,522
Post-Modification Recorded Investment			367	1,374
Charge-offs				148
Special Reserve				$ 45
No. of Loans	8	17	14	27
Pre-Modification Recorded Investment	$ 18,996	$ 2,224	$ 24,207	$ 19,007
Post-Modification Recorded Investment	18,996	2,224	24,207	18,859
Charge-offs				148
Special Reserve	$ 208	$ 1	$ 222	$ 84