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		6 Months Ended				12 Months Ended
	Jun. 30, 2013		Jun. 30, 2013		Jun. 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	$ 125		$ 125		$ 242		$ 170
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees	0.02%		0.02%		0.04%		0.03%
Accruing restructured loans	6,234		6,234		2,035		2,005
Impaired loans with no valuation allowance	15,946		15,946		12,374		16,974
Impaired loans with a valuation allowance	1,449		1,449		1,543		1,482
Total impaired loans	17,395		17,395		13,917		18,456
Valuation allowance	(273)		(273)		(362)		(554)
Impaired loans, net of allowance	17,122		17,122		13,555		17,902
Average recorded investment in impaired loans(1)	17,567	[1]	17,889	[1],[2]	14,055	[2]	13,540	[2],[3]
Interest income recognized on impaired loans, after designation as impaired	39		77		186		9
Amount of income recognized on a cash basis			$ 0		$ 0		$ 0

[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.