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	3 Months Ended		9 Months Ended				12 Months Ended
	Sep. 30, 2013		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Summary of Loans Past Due 90 Days or More and Impaired Loans [Abstract]
Loans past due 90 days or more and still accruing	$ 149		$ 149		$ 114		$ 170
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees	0.03%		0.03%		0.02%		0.03%
Accruing restructured loans	6,545		6,545		2,021		2,005
Impaired loans with no valuation allowance	14,874		14,874		11,063		16,974
Impaired loans with a valuation allowance	2,172		2,172		902		1,482
Total impaired loans	17,046		17,046		11,965		18,456
Valuation allowance	(631)		(631)		(327)		(554)
Impaired loans, net of allowance	16,415		16,415		11,638		17,902
Average recorded investment in impaired loans(1)	17,737	[1]	17,357	[1],[2]	13,831	[2]	13,540	[2],[3]
Interest income recognized on impaired loans, after designation as impaired	$ 57		$ 159		$ 292		$ 9

[1] Recorded investment includes the unpaid principal balance and any accrued interest and net deferred fees.

[2] Recorded investment includes principal, accrued interest and net deferred fees.

[3] Recorded investment includes the unpaid principal balance and any accrued interest and deferred fees.