Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Summary of Loans Past Due 90 Days or More and Impaired Loans (USD $) In Thousands, unless otherwise specified	9 Months Ended				12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Summary of Loans Past Due 90 Days or More and Impaired Loans [Abstract]
Loans past due 90 days or more and still accruing	$ 485	[1]	$ 149		$ 190	[1]
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees	0.08%		0.03%		0.03%
Accruing restructured loans	5,947		6,545		6,191
Impaired loans:
Impaired loans with no valuation allowance	9,223	[2]			10,635	[3]
Impaired loans with no valuation allowance			14,874		10,372
Impaired loans with a valuation allowance	5,964	[2]			2,354	[3]
Impaired loans with a valuation allowance			2,172		2,613
Total impaired loans	15,187		17,046		12,985
Valuation allowance	(296)		(631)		(624)
Impaired loans, net of allowance	14,891		16,415		12,361
Average recorded investment in impaired loans(1)	15,974	[2],[4]	17,357	[2]	16,654	[2],[3],[4]
Interest income recognized on impaired loans, after designation as impaired	$ 384	[4]	$ 159		$ 267	[4]

[1] Only classes with past-due or nonaccrual loans are shown.

[2] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.

[3] Recorded investment includes principal net of unearned interest and deferred fees and costs, and accrued interest.

[4] Only classes with impaired loans are shown.