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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
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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 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | $ 26,136 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | $ 20,937 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Current state income tax |  |  |  |  |  |  |  |  |  |  |  |  | 7,114 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | 6,147 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | 4,543 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Total current |  |  |  |  |  |  |  |  |  |  |  |  | 39,498 us-gaap_CurrentIncomeTaxExpenseBenefit | 32,283 us-gaap_CurrentIncomeTaxExpenseBenefit | 25,480 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred federal income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | (7,494)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (3,909)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (4,564)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred state income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | (46)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (56)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (33)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred |  |  |  |  |  |  |  |  |  |  |  |  | (7,540)us-gaap_DeferredIncomeTaxExpenseBenefit | (3,965)us-gaap_DeferredIncomeTaxExpenseBenefit | (4,597)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense | $ 9,347 us-gaap_IncomeTaxExpenseBenefit | $ 8,054 us-gaap_IncomeTaxExpenseBenefit | $ 7,618 us-gaap_IncomeTaxExpenseBenefit | $ 6,939 us-gaap_IncomeTaxExpenseBenefit | $ 6,983 us-gaap_IncomeTaxExpenseBenefit | $ 7,137 us-gaap_IncomeTaxExpenseBenefit | $ 7,212 us-gaap_IncomeTaxExpenseBenefit | $ 6,986 us-gaap_IncomeTaxExpenseBenefit | $ 6,135 us-gaap_IncomeTaxExpenseBenefit | $ 5,739 us-gaap_IncomeTaxExpenseBenefit | $ 4,692 us-gaap_IncomeTaxExpenseBenefit | $ 4,317 us-gaap_IncomeTaxExpenseBenefit | $ 31,958 us-gaap_IncomeTaxExpenseBenefit | $ 28,318 us-gaap_IncomeTaxExpenseBenefit | $ 20,883 us-gaap_IncomeTaxExpenseBenefit

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