Note 13 - Income Taxes (Detail) - Provision for Income Taxes (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current Tax Provision
Federal	$ 29,147	$ 29,311	$ 23,734
State	4,010	3,131	2,953
	33,157	32,442	26,687
Deferred Tax Provision
Federal	162	1,220	1,386
State	4	145	199
	166	1,365	1,585
Income Tax Provision	$ 33,323	$ 33,807	$ 28,272