Note 3 - Loans (Detail) - Loan Modifications (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 Commercial and Industrial [Member] Quarter to Date [Member]	Mar. 31, 2012 Commercial and Industrial [Member] Year to Date [Member]	Mar. 31, 2013 Commercial Real Estate Loans [Member] Quarter to Date [Member]	Mar. 31, 2012 Commercial Real Estate Loans [Member] Year to Date [Member]	Mar. 31, 2013 First Lien Residential Mortgage Loans [Member] Quarter to Date [Member]	Mar. 31, 2012 First Lien Residential Mortgage Loans [Member] Year to Date [Member]	Mar. 31, 2013 Junior Lein Residential Mortgage Loans [Member] Quarter to Date [Member]	Mar. 31, 2012 Junior Lein Residential Mortgage Loans [Member] Year to Date [Member]	Mar. 31, 2013 Consumer Loans [Member] Quarter to Date [Member]	Mar. 31, 2012 Consumer Loans [Member] Year to Date [Member]	Mar. 31, 2013 Quarter to Date [Member]	Mar. 31, 2012 Year to Date [Member]
Troubled Debt Restructurings Number of contracts	3	5	5	8	2	4	0	2	0	2	10	21
Troubled Debt Restructurings Pre-modification outstanding recorded investment	$ 89	$ 787	$ 1,661	$ 1,985	$ 263	$ 377	$ 0	$ 103	$ 0	$ 107	$ 2,013	$ 3,359
Troubled Debt Restructurings Post-modification outstanding recorded investment	88	782	1,671	1,983	263	377	0	103	0	107	2,022	3,352
Troubled Debt Restructurings that Subsequently Defaulted Number of contracts	1	0	0	4	3	6	0	0	0	0	4	10
Troubled Debt Restructurings that Subsequently Defaulted Recorded investment	$ 9	$ 0	$ 0	$ 1,047	$ 396	$ 561	$ 0	$ 0	$ 0	$ 0	$ 405	$ 1,608