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Note 14 - Income Taxes (Details) - Federal and State Income Tax Expense - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
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