Note 5 - Income Taxes (Detail) - Components of the provision for income taxes: (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal	$ 12,728	$ 6,524	$ 2,747
State	587	1,362	1,645
	13,315	7,886	4,392
Federal	5,542	9,837	10,761
State	(720)	239	(211)
	4,822	10,076	10,550
Total provision	$ 18,137	$ 17,962	$ 14,942