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Note 8 - Income Taxes (Details) - Provision for Income Taxes (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Provision for Income Taxes [Abstract]
Income taxes currently payable	$ 5,760us-gaap_CurrentIncomeTaxExpenseBenefit	$ 3,599us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income taxes	(1,578)us-gaap_DeferredIncomeTaxExpenseBenefit	(2,667)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes	$ 4,182us-gaap_IncomeTaxExpenseBenefit	$ 932us-gaap_IncomeTaxExpenseBenefit

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

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