Note 8 - Income Taxes (Detail) - Reconciliation of income tax expense (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statutory federal rate applied to income before income tax expense	$ 16,561	$ 4,751	$ 12,814
Current year permanent items	825	229	618
State and local taxes, net of federal tax benefit	4,191	710	1,993
Change in valuation allowance	(1,463)	(252)	(1,591)
Reserve for uncertain tax positions	(1,015)	(905)	(513)
Other items, net	89	6	126
Income tax expense as recorded	$ 19,188	$ 4,539	$ 13,447
Effective income tax rate	40.60%	33.40%	36.70%