Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans [Line Items]
Average investment in impaired loans	$ 12,010	$ 14,595	$ 12,375	$ 15,129
Interest income recognized on impaired loans on a cash basis	144	210	329	373
Residential Portfolio Segment [Member]
Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans [Line Items]
Average investment in impaired loans	3,767	4,724	3,876	4,707
Interest income recognized on impaired loans on a cash basis	21	24	60	48
Residential Portfolio Segment [Member] | Senior Lien [Member] | Real Estate Loan [Member]
Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans [Line Items]
Average investment in impaired loans	3,701	4,527	3,819	4,493
Interest income recognized on impaired loans on a cash basis	20	24	58	46
Residential Portfolio Segment [Member] | Junior Lien [Member] | Real Estate Loan [Member]
Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans [Line Items]
Average investment in impaired loans	66	197	57	214
Interest income recognized on impaired loans on a cash basis	1	0	2	2
Commercial Portfolio Segment [Member]
Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans [Line Items]
Average investment in impaired loans	8,243	9,870	8,499	10,420
Interest income recognized on impaired loans on a cash basis	123	186	269	325
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans [Line Items]
Average investment in impaired loans	6,286	7,261	6,437	7,589
Interest income recognized on impaired loans on a cash basis	90	156	203	267
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans [Line Items]
Average investment in impaired loans	423	882	513	986
Interest income recognized on impaired loans on a cash basis	5	9	12	19
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans [Line Items]
Average investment in impaired loans	41	408	58	519
Interest income recognized on impaired loans on a cash basis	0	2	0	4
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans [Line Items]
Average investment in impaired loans	1,447	1,274	1,468	1,280
Interest income recognized on impaired loans on a cash basis	26	18	52	33
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans [Line Items]
Average investment in impaired loans	46	45	23	46
Interest income recognized on impaired loans on a cash basis	2	1	2	2
Consumer Portfolio Segment [Member]
Note 7 - Loans (Details) - Average Balance of Impaired Loans and Income Recognized on Impaired Loans [Line Items]
Average investment in impaired loans	0	1	0	2
Interest income recognized on impaired loans on a cash basis	$ 0	$ 0	$ 0	$ 0