Note 10 - Income Taxes (Details) - Effective Income Tax Rate Reconciliation: (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effective Income Tax Rate Reconciliation: [Abstract]
Taxes at federal statutory rate									$ 21,248	$ 19,662	$ 20,586
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									3,648	3,320	3,718
State and local income tax, net of Federal income tax benefit									6.00%	5.90%	6.30%
Other									(1,940)	(1,135)	(835)
Other									(3.20%)	(2.00%)	(1.40%)
Taxes at effective rate	$ 6,458	$ 6,024	$ 6,155	$ 4,319	$ 5,782	$ 5,988	$ 5,519	$ 4,558	$ 22,956	$ 21,847	$ 23,469
Taxes at effective rate									37.80%	38.90%	39.90%