Note 7 - Federal Funds Purchased and Other Short-term Borrowings (Detail) - Federal Funds Purchased and Other Short-Term Borrowings (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Federal funds purchased and securities sold under agreement to repurchase	$ 24,083	$ 27,022
Total short-term	24,083	27,022
Average balance during the year	26,134	38,043
Maximum month-end balance during the year	$ 31,632	$ 72,810
Average interest rate during the year	0.37%	0.50%
Average interest rate at year-end	0.29%	0.53%