Note 8 - Loans and Allowance for Loan Losses (Details) - Impaired Loans (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Commercial:
Loans with no specific allowance recorded, recorded investment (after charge-offs)	$ 18,291	$ 22,515
Loans with no specific allowance recorded, unpaid principal balance	19,375	23,404
Commercial:
Loans with an allowance recorded, recorded investment (after charge-offs)	3,388	5,102
Loans with an allowance recorded, unpaid principal balance	3,751	5,609
Loans, related allowance	1,913	2,022
Commercial:
Loans, recorded investment (after charge-offs)	21,679	27,617
Loans, unpaid principal balance	23,126	29,013
Loans, related allowance	1,913	2,022
Loans, average recorded investment	26,278	29,254
Loans, interest income recognized	542	560
Commercial and Industrial [Member]
Commercial:
Loans with no specific allowance recorded, recorded investment (after charge-offs)	6,431	8,222
Loans with no specific allowance recorded, unpaid principal balance	6,580	8,417
Commercial:
Loans with an allowance recorded, recorded investment (after charge-offs)	1,294	2,082
Loans with an allowance recorded, unpaid principal balance	1,475	2,350
Loans, related allowance	1,194	1,106
Commercial:
Loans, recorded investment (after charge-offs)	7,725	10,304
Loans, unpaid principal balance	8,055	10,767
Loans, related allowance	1,194	1,106
Loans, average recorded investment	9,713	6,732
Loans, interest income recognized	256	34
Commercial Construction [Member]
Commercial:
Loans with no specific allowance recorded, recorded investment (after charge-offs)	1,184	916
Loans with no specific allowance recorded, unpaid principal balance	1,514	1,140
Commercial:
Loans with an allowance recorded, recorded investment (after charge-offs)		435
Loans with an allowance recorded, unpaid principal balance		493
Loans, related allowance		121
Commercial:
Loans, recorded investment (after charge-offs)	1,184	1,351
Loans, unpaid principal balance	1,514	1,633
Loans, related allowance		121
Loans, average recorded investment	1,205	3,179
Loans, interest income recognized	1	46
Commercial:Secured by Commercial Real Estate [Member]
Commercial:
Loans with no specific allowance recorded, recorded investment (after charge-offs)	10,081	12,251
Loans with no specific allowance recorded, unpaid principal balance	10,594	12,568
Commercial:
Loans with an allowance recorded, recorded investment (after charge-offs)		37
Loans with an allowance recorded, unpaid principal balance		37
Loans, related allowance		9
Commercial:
Loans, recorded investment (after charge-offs)	10,081	12,288
Loans, unpaid principal balance	10,594	12,605
Loans, related allowance		9
Loans, average recorded investment	12,045	13,765
Loans, interest income recognized	281	399
Commercial Secured By Residential Real Estate [Member]
Commercial:
Loans with no specific allowance recorded, recorded investment (after charge-offs)	288	728
Loans with no specific allowance recorded, unpaid principal balance	333	839
Commercial:
Loans with an allowance recorded, recorded investment (after charge-offs)	1,873	2,105
Loans with an allowance recorded, unpaid principal balance	2,031	2,248
Loans, related allowance	676	639
Commercial:
Loans, recorded investment (after charge-offs)	2,161	2,833
Loans, unpaid principal balance	2,364	3,087
Loans, related allowance	676	639
Loans, average recorded investment	2,615	3,090
Loans, interest income recognized		23
State And Political Subdivisions [Member]
Commercial:
Loans, average recorded investment		1,636
Loans, interest income recognized		53
Indirect Lease Financing [Member]
Commercial:
Loans with no specific allowance recorded, recorded investment (after charge-offs)	28	13
Loans with no specific allowance recorded, unpaid principal balance	30	16
Commercial:
Loans with an allowance recorded, recorded investment (after charge-offs)		24
Loans with an allowance recorded, unpaid principal balance		27
Loans, related allowance		3
Commercial:
Loans, recorded investment (after charge-offs)	28	37
Loans, unpaid principal balance	30	43
Loans, related allowance		3
Loans, average recorded investment	27	63
Retail:1-4 Family Residential Mortgages [Member]
Commercial:
Loans with no specific allowance recorded, recorded investment (after charge-offs)	230	250
Loans with no specific allowance recorded, unpaid principal balance	252	274
Commercial:
Loans with an allowance recorded, recorded investment (after charge-offs)	117	272
Loans with an allowance recorded, unpaid principal balance	117	284
Loans, related allowance	4	63
Commercial:
Loans, recorded investment (after charge-offs)	347	522
Loans, unpaid principal balance	369	558
Loans, related allowance	4	63
Loans, average recorded investment	495	495
Loans, interest income recognized	4	5
Retail Home Equity Loans And Lines [Member]
Commercial:
Loans with no specific allowance recorded, recorded investment (after charge-offs)	49	135
Loans with no specific allowance recorded, unpaid principal balance	72	150
Commercial:
Loans with an allowance recorded, recorded investment (after charge-offs)	104	131
Loans with an allowance recorded, unpaid principal balance	128	154
Loans, related allowance	39	70
Commercial:
Loans, recorded investment (after charge-offs)	153	266
Loans, unpaid principal balance	200	304
Loans, related allowance	39	70
Loans, average recorded investment	176	293
Retail:Consumer [Member]
Commercial:
Loans with an allowance recorded, recorded investment (after charge-offs)		16
Loans with an allowance recorded, unpaid principal balance		16
Loans, related allowance		11
Commercial:
Loans, recorded investment (after charge-offs)		16
Loans, unpaid principal balance		16
Loans, related allowance		11
Loans, average recorded investment	$ 2	$ 1