Note 13 - Income Taxes (Details) - Income Tax Expense (Benefits) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current provision-
Federal	$ 21,826us-gaap_CurrentFederalTaxExpenseBenefit	$ 7,755us-gaap_CurrentFederalTaxExpenseBenefit	$ 8,647us-gaap_CurrentFederalTaxExpenseBenefit
State	3,531	2,008	1,917
	25,357us-gaap_CurrentIncomeTaxExpenseBenefit	9,763us-gaap_CurrentIncomeTaxExpenseBenefit	10,564us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred provision-
Federal	23,243	20,470	25,752
State	1,986	1,611	2,412
	25,229us-gaap_DeferredIncomeTaxExpenseBenefit	22,081us-gaap_DeferredIncomeTaxExpenseBenefit	28,164us-gaap_DeferredIncomeTaxExpenseBenefit
Provision (benefit) for income taxes	$ 50,586us-gaap_IncomeTaxExpenseBenefit	$ 31,844us-gaap_IncomeTaxExpenseBenefit	$ 38,728us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.