Note 13 - Income Taxes (Detail) - Unrecognized Tax Benefits (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unrecognized tax benefits	$ 1,337	$ 1,466	$ 1,761
Gross increases – tax positions in current year	358	290	177
Gross increases – tax positions in a prior year	267	119
Reductions due to lapse of statute of limitations	(553)	(538)	(472)
Unrecognized tax benefits	$ 1,409	$ 1,337	$ 1,466