Note 8 - Disclosures about Fair Value of Assets and Liabilities (Detail) - Fair Value of Assets Measured on Non-Recurring Basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets fair value	$ 8,888	$ 10,557
Impaired Loans [Member]
Assets fair value	8,888	10,557
Foreclosed Assets Held for Sale [Member] | Fair Value, Inputs, Level 3 [Member]
Assets fair value	23	3,883
Foreclosed Assets Held for Sale [Member]
Assets fair value	$ 23	$ 3,883