Note 5 - Loans (Details) - Troubled Debt Restructuring - Accruing Troubled Debt Restructuring [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Note 5 - Loans (Details) - Troubled Debt Restructuring [Line Items]
No. of Loans	28	14	25
Pre-Modification Recorded Investment	$ 19,906	$ 25,071	$ 28,852
Post-Modification Recorded Investment	19,759	25,071	27,608
Specific Reserve	752	$ 5,600	982
Charge-offs	$ 148		$ 1,244
Commercial Portfolio Segment [Member]
Note 5 - Loans (Details) - Troubled Debt Restructuring [Line Items]
No. of Loans	3	4	9
Pre-Modification Recorded Investment	$ 1,181	$ 10,539	$ 12,026
Post-Modification Recorded Investment	1,181	10,539	10,860
Specific Reserve	$ 2	$ 21	550
Charge-offs			$ 1,166
Commercial Real Estate Portfolio Segment [Member]
Note 5 - Loans (Details) - Troubled Debt Restructuring [Line Items]
No. of Loans	20	3	5
Pre-Modification Recorded Investment	$ 17,204	$ 11,817	$ 13,090
Post-Modification Recorded Investment	17,204	11,817	13,090
Specific Reserve	$ 708	$ 5,550	$ 329
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Note 5 - Loans (Details) - Troubled Debt Restructuring [Line Items]
No. of Loans	5	7	11
Pre-Modification Recorded Investment	$ 1,521	$ 2,715	$ 3,736
Post-Modification Recorded Investment	1,374	2,715	3,658
Specific Reserve	42	$ 29	103
Charge-offs	$ 148		$ 78