Note 3 - Loans (Detail) - Impaired loans, which included troubled debt restructurings (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Recorded Investment in Loans	$ 6,941	$ 16,492
Unpaid Principal Balance	7,459	16,848
Related Allowance	1,123	3,801
Average Balance-Impaired Loans	7,229	18,527
Interest Income Recognized	101	643
Real Estate - Residential Mortgage (Member)
Recorded Investment in Loans	1,844	2,230
Unpaid Principal Balance	2,066	2,283
Related Allowance	401	433
Average Balance-Impaired Loans	2,022	2,266
Interest Income Recognized	28	124
Commercial real estate lending [Member]
Recorded Investment in Loans	3,967	7,892
Unpaid Principal Balance	4,259	8,190
Related Allowance	582	1,775
Average Balance-Impaired Loans	4,074	8,260
Interest Income Recognized	68	254
Commercial Business Lending [Member]
Recorded Investment in Loans	807	812
Unpaid Principal Balance	811	817
Related Allowance	92	112
Average Balance-Impaired Loans	810	827
Interest Income Recognized	2	13
consumer (Member)
Recorded Investment in Loans	323	324
Unpaid Principal Balance	323	324
Related Allowance	48	49
Average Balance-Impaired Loans	323	324
Interest Income Recognized	3	16
Land acquisition and development lending [Member]
Recorded Investment in Loans		5,234
Unpaid Principal Balance		5,234
Related Allowance		1,432
Average Balance-Impaired Loans		5,443
Interest Income Recognized		236
Builder Line Lending [Member]
Average Balance-Impaired Loans		$ 1,407