Note 3 - Loans (Detail) - Information On Impaired Loans (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Commercial And Industrial [Member] | No Allowance [Member]
Recorded Investment	$ 7,333	$ 3,647
Unpaid Principal Balance	7,343	3,652
Average Recorded Investment	5,752	8,901
Commercial And Industrial [Member] | With Allowance [Member]
Recorded Investment	23	7,018
Unpaid Principal Balance	23	7,025
Related Allowance	23	224
Average Recorded Investment	3,183	4,835
Real Estate Mortgage Residential [Member] | No Allowance [Member]
Recorded Investment	184	251
Unpaid Principal Balance	184	251
Average Recorded Investment	216	263
Real Estate Mortgage Commercial [Member] | No Allowance [Member]
Recorded Investment	22,258	19,922
Unpaid Principal Balance	22,260	19,913
Average Recorded Investment	19,859	26,256
Real Estate Mortgage Commercial [Member] | With Allowance [Member]
Recorded Investment	4,999	10,678
Unpaid Principal Balance	4,986	10,696
Related Allowance	953	710
Average Recorded Investment	6,836	14,042
Real Estate Construction Residential [Member] | No Allowance [Member]
Recorded Investment	2,345
Unpaid Principal Balance	2,345
Average Recorded Investment	1,172
Real Estate Construction Commercial [Member] | No Allowance [Member]
Recorded Investment	3,147	3,324
Unpaid Principal Balance	3,147	3,324
Average Recorded Investment	3,226	831
Commercial And Industrial [Member]
Recorded Investment	7,356	10,665
Unpaid Principal Balance	7,366	10,677
Related Allowance	23	224
Average Recorded Investment	8,935	13,736
Real Estate Mortgage [Member]
Recorded Investment	27,441	30,851
Unpaid Principal Balance	27,430	30,860
Related Allowance	953	710
Average Recorded Investment	26,911	40,561
Real Estate Construction [Member]
Recorded Investment	5,492	3,324
Unpaid Principal Balance	5,492	3,324
Average Recorded Investment	$ 4,398	$ 831