Note 3 - Loans (Detail) - Information On Impaired Loans (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Commercial And Industrial [Member] | None [Member]
Recorded Investment	$ 8,360	$ 3,647
Unpaid Principal Balance	8,369	3,652
Average Recorded Investment	5,824	8,901
Commercial And Industrial [Member] | With Allowance [Member]
Recorded Investment	26	7,018
Unpaid Principal Balance	26	7,025
Related Allowance	26	224
Average Recorded Investment	4,649	4,835
Real Estate Mortgage Residential [Member] | None [Member]
Recorded Investment	185	251
Unpaid Principal Balance	185	251
Average Recorded Investment	235	263
Real Estate Mortgage Commercial [Member] | None [Member]
Recorded Investment	15,385	19,922
Unpaid Principal Balance	15,399	19,913
Average Recorded Investment	18,922	26,256
Real Estate Mortgage Commercial [Member] | With Allowance [Member]
Recorded Investment	4,612
Unpaid Principal Balance	4,609
Related Allowance	790
Average Recorded Investment	9,580
Real Estate Construction Residential [Member] | None [Member]
Recorded Investment	2,345
Unpaid Principal Balance	2,345
Average Recorded Investment	586
Real Estate Construction Commercial [Member] | None [Member]
Recorded Investment	3,172	3,324
Unpaid Principal Balance	3,172	3,324
Average Recorded Investment	2,440	831
Real Estate Construction Commercial [Member] | With Allowance [Member]
Recorded Investment		10,678
Unpaid Principal Balance		10,696
Related Allowance		710
Average Recorded Investment		14,042
Commercial And Industrial [Member]
Recorded Investment	8,386	10,665
Unpaid Principal Balance	8,395	10,677
Related Allowance	26	224
Average Recorded Investment	10,473	13,736
Real Estate Mortgage [Member]
Recorded Investment	20,182	30,851
Unpaid Principal Balance	20,193	30,860
Related Allowance	790	710
Average Recorded Investment	28,737	40,561
Real Estate Construction [Member]
Recorded Investment	5,517	3,324
Unpaid Principal Balance	5,517	3,324
Average Recorded Investment	$ 3,026	$ 831