Note 10 - Income Taxes (Detail) - Effective income tax rate reconciliation: (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Taxes at federal statutory rate (in Dollars)									$ 19,662	$ 20,586	$ 19,172
Taxes at federal statutory rate									35.00%	35.00%	35.00%
Increase (reduction) in taxes resulting from:
State and local income tax, net of Federal income tax benefit (in Dollars)									3,320	3,718	(2,211)
State and local income tax, net of Federal income tax benefit									5.90%	6.30%	(4.00%)
Other (in Dollars)									(1,135)	(835)	(1,020)
Other									(2.00%)	(1.40%)	(1.90%)
Taxes at effective rate (in Dollars)	$ 5,782	$ 5,988	$ 5,519	$ 4,558	$ 5,664	$ 6,756	$ 5,991	$ 5,058	$ 21,847	$ 23,469	$ 15,941
Taxes at effective rate									38.90%	39.90%	29.10%