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Note 12 - Income Taxes (Details) - Federal and State Income Tax Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	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, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal and State Income Tax Expense [Abstract]
Current federal income tax													$ 32,384	$ 26,136	$ 20,937
Current state income tax													7,114	6,147	4,543
Total current													39,498us-gaap_CurrentIncomeTaxExpenseBenefit	32,283us-gaap_CurrentIncomeTaxExpenseBenefit	25,480us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred federal income tax benefit													(7,494)	(3,909)	(4,564)
Deferred state income tax benefit													(46)	(56)	(33)
Total deferred													(7,540)us-gaap_DeferredIncomeTaxExpenseBenefit	(3,965)us-gaap_DeferredIncomeTaxExpenseBenefit	(4,597)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense	$ 9,347us-gaap_IncomeTaxExpenseBenefit	$ 8,054us-gaap_IncomeTaxExpenseBenefit	$ 7,618us-gaap_IncomeTaxExpenseBenefit	$ 6,939us-gaap_IncomeTaxExpenseBenefit	$ 6,983us-gaap_IncomeTaxExpenseBenefit	$ 7,137us-gaap_IncomeTaxExpenseBenefit	$ 7,212us-gaap_IncomeTaxExpenseBenefit	$ 6,986us-gaap_IncomeTaxExpenseBenefit	$ 6,135us-gaap_IncomeTaxExpenseBenefit	$ 5,739us-gaap_IncomeTaxExpenseBenefit	$ 4,692us-gaap_IncomeTaxExpenseBenefit	$ 4,317us-gaap_IncomeTaxExpenseBenefit	$ 31,958us-gaap_IncomeTaxExpenseBenefit	$ 28,318us-gaap_IncomeTaxExpenseBenefit	$ 20,883us-gaap_IncomeTaxExpenseBenefit

Amount of current income tax expense (benefit) pertaining to taxable 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.