Note 6 - Loans (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Note 6 - Loans (Details) [Line Items]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	$ 53,000	$ 378,000		$ 378,000		$ 53,000
Additional Interest Income		212,000	314,000	541,000	559,000
Impaired Financing Receivable, Recorded Investment	42,141,000	34,343,000		34,343,000		42,141,000
Percentage Of Collateral Coverage To Loan Balance To Consider Restructured Loan To Performing And Accrual Status				100.00%
Obligations To Lend Additional Funds On Restructured Loans	0	0		0		0
Financing Receivable, Modifications, Recorded Investment	33,400,000	25,700,000		25,700,000		33,400,000
Financing Receivable, Modifications, Number of Contracts		4	6	6	15
Troubled Debt Restructurings Percentage Of Gross Portfolio Loans	5.59%	3.95%		3.95%		5.59%
Doubtful Grade Remaining Outstanding Period Minimum				6 months
Financing Receivable, Allowance for Credit Losses	14,172,000	10,400,000		10,400,000		14,172,000	11,103,000
Percentage Of Allowance For Loan And Lease Losses Out Of Net Loans	2.37%	1.60%		1.60%		2.37%
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset		206,600,000		206,600,000
Reserve For Off Balance Sheet Commitments		696,000		696,000
Allowance for Loan and Lease Losses Write-offs, Net				6,300,000
Proceeds from Recoveries of Loans Previously Charged off						319,000
Percentage Of Loan Portfolio Secured By Real Estate		71.00%		71.00%
Percentage Of Unallocated Allowance Amount Out Of Allowance For Loan And Lease Losses	13.00%			1.00%
Loans 30 Days Past Due [Member]
Note 6 - Loans (Details) [Line Items]
Number Of Days For Loan Past Due				30 days
Loans 60 Days Past Due [Member]
Note 6 - Loans (Details) [Line Items]
Number Of Days For Loan Past Due				60 days
Loans 90 Days Past Due [Member]
Note 6 - Loans (Details) [Line Items]
Number Of Days For Loan Past Due				90 days
Performing Loans [Member]
Note 6 - Loans (Details) [Line Items]
Impaired Financing Receivable, Recorded Investment	8,800,000	9,100,000		9,100,000		8,800,000
Financing Receivable, Modifications, Number of Contracts				100
Troubled Debt Restructuring [Member]
Note 6 - Loans (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts				118
Commercial and Industrial [Member]
Note 6 - Loans (Details) [Line Items]
Allowance for Loan and Lease Losses, Write-offs				3,400,000		3,400,000
Commercial Real Estate and Farmland [Member]
Note 6 - Loans (Details) [Line Items]
Allowance for Loan and Lease Losses, Write-offs				1,400,000		1,400,000
Commercial Real Estate Loans To A Third Relationship [Member]
Note 6 - Loans (Details) [Line Items]
Allowance for Loan and Lease Losses, Write-offs				1,000,000
Commercial Real Estate Portfolio Segment [Member]
Note 6 - Loans (Details) [Line Items]
Impaired Financing Receivable, Recorded Investment	21,747,000	11,965,000		11,965,000		21,747,000
Allowance for Loan and Lease Losses, Write-offs						1,000,000
Financing Receivable, Allowance for Credit Losses	$ 2,784,000	$ 4,251,000		$ 4,251,000		$ 2,784,000	$ 2,783,000
Minimum [Member]
Note 6 - Loans (Details) [Line Items]
Frequency Of External Appraisals Updating				6 months
Maximum [Member]
Note 6 - Loans (Details) [Line Items]
Frequency Of External Appraisals Updating				12 months