Note 13 - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Taxes at federal statutory rate	$ 17,903	$ 8,524	$ 23,215	$ 13,522
Taxes at federal statutory rate	35.00%	35.00%	35.00%	35.00%
Increase (reduction) in taxes resulting from:
State and local income tax, net of Federal income tax benefit	$ 3,584	$ 1,538	$ 4,148	$ 2,379
State and local income tax, net of Federal income tax benefit	7.00%	6.30%	6.30%	6.20%
Other	$ (770)	$ (541)	$ (1,031)	$ (834)
Other	(1.50%)	(2.20%)	(1.60%)	(2.20%)
Total income tax provision	$ 20,717	$ 9,521	$ 26,332	$ 15,067
Taxes at effective rate	40.50%	39.10%	39.70%	39.00%