Note 7 - Current and Deferred Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 160,235	$ 130,761	$ 144,299
State and local	22,306	19,705	18,811
Current income taxes, total	182,541	150,466	163,110
Deferred:
Federal	71,292	72,547	41,811
State and local	9,135	6,796	6,265
Deferred income taxes, total	80,427	79,343	48,076
Total tax expense	$ 262,968	$ 229,809	$ 211,186