Note 7 - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statutory federal rate applied to income before income tax expense	$ 23,012	$ 27,929	$ 11,002
Current year permanent items	1,192	849	669
State and local taxes, net of federal tax benefit	2,831	4,050	1,432
Change in valuation allowance	(369)	(696)	(409)
Reserve for uncertain tax positions	(581)	(198)	(136)
Other items, net	363	(198)	589
Income tax expense as recorded	$ 26,448	$ 31,736	$ 13,147
Effective income tax rate	40.20%	39.80%	41.80%