Note 7 - Loans (Details) - Allowance for Loan Losses - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Allowance for Loan Losses:
Allowance for loan losses	$ 7,134	$ 8,343	$ 7,336	$ 8,663
Allowance for loan losses, charge-offs	(77)	(1,546)	(299)	(1,820)
Allowance for loan losses, recoveries	22	24	39	289
Allowance for loan losses, provision (credit)	221	446	224	135
Allowance for loan losses	7,300	7,267	7,300	7,267
Residential Portfolio Segment [Member]
Allowance for Loan Losses:
Allowance for loan losses	3,503	3,567	3,653	3,705
Allowance for loan losses, charge-offs	(58)	(40)	(137)	(59)
Allowance for loan losses, recoveries	0	1	1	1
Allowance for loan losses, provision (credit)	141	168	69	49
Allowance for loan losses	3,586	3,696	3,586	3,696
Residential Portfolio Segment [Member] | Home Equity Line of Credit1 [Member]
Allowance for Loan Losses:
Allowance for loan losses	322	271	322	269
Allowance for loan losses, charge-offs	0	0	0	0
Allowance for loan losses, recoveries	0	0	0	0
Allowance for loan losses, provision (credit)	22	6	22	8
Allowance for loan losses	344	277	344	277
Residential Portfolio Segment [Member] | Construction Loans [Member]
Allowance for Loan Losses:
Allowance for loan losses	207	153	214	168
Allowance for loan losses, charge-offs	0	0	0	0
Allowance for loan losses, recoveries	0	0	0	0
Allowance for loan losses, provision (credit)	50	20	43	5
Allowance for loan losses	257	173	257	173
Residential Portfolio Segment [Member] | Senior Lien [Member] | Real Estate Loan [Member]
Allowance for Loan Losses:
Allowance for loan losses	2,774	2,863	2,941	2,974
Allowance for loan losses, charge-offs	(58)	(40)	(137)	(59)
Allowance for loan losses, recoveries	0	1	1	1
Allowance for loan losses, provision (credit)	59	142	(30)	50
Allowance for loan losses	2,775	2,966	2,775	2,966
Residential Portfolio Segment [Member] | Junior Lien [Member] | Real Estate Loan [Member]
Allowance for Loan Losses:
Allowance for loan losses	200	280	176	294
Allowance for loan losses, charge-offs	0	0	0	0
Allowance for loan losses, recoveries	0	0	0	0
Allowance for loan losses, provision (credit)	10	0	34	(14)
Allowance for loan losses	210	280	210	280
Commercial Portfolio Segment [Member]
Allowance for Loan Losses:
Allowance for loan losses	3,098	4,254	3,143	4,367
Allowance for loan losses, charge-offs	0	(1,486)	(125)	(1,715)
Allowance for loan losses, recoveries	3	12	4	263
Allowance for loan losses, provision (credit)	82	269	161	134
Allowance for loan losses	3,183	3,049	3,183	3,049
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Allowance for Loan Losses:
Allowance for loan losses	1,736	3,081	1,758	3,123
Allowance for loan losses, charge-offs	0	(1,486)	(115)	(1,521)
Allowance for loan losses, recoveries	0	0	0	250
Allowance for loan losses, provision (credit)	(44)	301	49	44
Allowance for loan losses	1,692	1,896	1,692	1,896
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Allowance for Loan Losses:
Allowance for loan losses	286	247	283	267
Allowance for loan losses, charge-offs	0	0	0	(170)
Allowance for loan losses, recoveries	0	5	0	5
Allowance for loan losses, provision (credit)	10	(89)	13	61
Allowance for loan losses	296	163	296	163
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Allowance for Loan Losses:
Allowance for loan losses	684	555	688	591
Allowance for loan losses, charge-offs	0	0	(10)	(24)
Allowance for loan losses, recoveries	3	7	4	8
Allowance for loan losses, provision (credit)	113	64	118	51
Allowance for loan losses	800	626	800	626
Commercial Portfolio Segment [Member] | Political Subdivisions [Member]
Allowance for Loan Losses:
Allowance for loan losses	0	0	0	0
Allowance for loan losses, charge-offs	0	0	0	0
Allowance for loan losses, recoveries	0	0	0	0
Allowance for loan losses, provision (credit)	0	0	0	0
Allowance for loan losses	0	0	0	0
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Allowance for Loan Losses:
Allowance for loan losses	159	98	165	115
Allowance for loan losses, charge-offs	0	0	0	0
Allowance for loan losses, recoveries	0	0	0	0
Allowance for loan losses, provision (credit)	(4)	(2)	(10)	(19)
Allowance for loan losses	155	96	155	96
Commercial Portfolio Segment [Member] | Multi-family (5 or more) Residential [Member]
Allowance for Loan Losses:
Allowance for loan losses	81	105	87	103
Allowance for loan losses, charge-offs	0	0	0	0
Allowance for loan losses, recoveries	0	0	0	0
Allowance for loan losses, provision (credit)	(1)	(2)	(7)	0
Allowance for loan losses	80	103	80	103
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Allowance for Loan Losses:
Allowance for loan losses	29	30	31	30
Allowance for loan losses, charge-offs	0	0	0	0
Allowance for loan losses, recoveries	0	0	0	0
Allowance for loan losses, provision (credit)	11	0	9	0
Allowance for loan losses	40	30	40	30
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member]
Allowance for Loan Losses:
Allowance for loan losses	123	138	131	138
Allowance for loan losses, charge-offs	0	0	0	0
Allowance for loan losses, recoveries	0	0	0	0
Allowance for loan losses, provision (credit)	(3)	(3)	(11)	(3)
Allowance for loan losses	120	135	120	135
Consumer Portfolio Segment [Member]
Allowance for Loan Losses:
Allowance for loan losses	139	128	145	193
Allowance for loan losses, charge-offs	(19)	(20)	(37)	(46)
Allowance for loan losses, recoveries	19	11	34	25
Allowance for loan losses, provision (credit)	(4)	8	(7)	(45)
Allowance for loan losses	135	127	135	127
Unallocated Financing Receivables [Member]
Allowance for Loan Losses:
Allowance for loan losses	394	394	395	398
Allowance for loan losses, charge-offs	0	0	0	0
Allowance for loan losses, recoveries	0	0	0	0
Allowance for loan losses, provision (credit)	2	1	1	(3)
Allowance for loan losses	$ 396	$ 395	$ 396	$ 395