Note 5 - Loans - Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
No. of Contracts	30	28	14
Pre-Modification Outstanding Recorded Investment	$ 34,735	$ 19,906	$ 25,071
Post-Modification Outstanding Recorded Investment	33,905	19,759	25,071
Specific Reserve	1,780	752	5,600
Charge-offs	$ 830	$ 148
Commercial Portfolio Segment [Member]
No. of Contracts	24	3	4
Pre-Modification Outstanding Recorded Investment	$ 30,215	$ 1,181	$ 10,539
Post-Modification Outstanding Recorded Investment	29,385	1,181	10,539
Specific Reserve	1,746	2	21
Charge-offs	$ 830
Commercial Real Estate Portfolio Segment [Member]
No. of Contracts	4	20	3
Pre-Modification Outstanding Recorded Investment	$ 4,153	$ 17,204	$ 11,817
Post-Modification Outstanding Recorded Investment	4,153	17,204	11,817
Specific Reserve	34	708	5,550
Charge-offs
Residential Mortgage and Equity Lines Portfolio Segment [Member]
No. of Contracts	2	5	7
Pre-Modification Outstanding Recorded Investment	$ 367	$ 1,521	$ 2,715
Post-Modification Outstanding Recorded Investment	367	1,374	2,715
Specific Reserve		42	29
Charge-offs		$ 148