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Note 14 - Income Taxes (Details) - Federal and State Income Tax Expense - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | 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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Federal and State Income Tax Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current federal income tax |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,758 | $ 32,384 | $ 26,136
Current state income tax |  |  |  |  |  |  |  |  |  |  |  |  | 11,020 | 7,114 | 6,147
Total current |  |  |  |  |  |  |  |  |  |  |  |  | 57,778 | 39,498 | 32,283
Deferred federal income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | (6,642) | (7,494) | (3,909)
Deferred state income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | (87) | (46) | (56)
Total deferred |  |  |  |  |  |  |  |  |  |  |  |  | (6,729) | (7,540) | (3,965)
Total income tax expense | $ 13,485 | $ 13,054 | $ 12,776 | $ 11,734 | $ 9,347 | $ 8,054 | $ 7,618 | $ 6,939 | $ 6,983 | $ 7,137 | $ 7,212 | $ 6,986 | $ 51,049 | $ 31,958 | $ 28,318

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