Note 10 - Income Taxes Reconciliation of Taxes from Statutory Rate to Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate		35.00%	35.00%	35.00%
(Benefit) provision for income taxes computed at the statutory tax rate		$ 121,358	$ 169,290	$ 153,240
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount		(96)	9,988	(6,674)
State tax expense (benefit)		(15,641)	(8,974)	(7,619)
Valuation allowance		18,197	10,663	11,931
Effective Income Tax Rate Reconciliation, Remeasurement of Net DTA, Amount		102,617
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount		(786)	(5,534)	5,412
Income tax (benefit) provision		$ 225,649	$ 175,433	$ 156,290
Subsequent Event [Member]
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	21.00%