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Note 10 - Income Taxes - Income Tax Provisions (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Federal:                      
Federal tax provision, current                 $ 14,859 $ 34,996 $ 25,319
Federal tax provision, deferred                 7,985 (1,416) (3,476)
Total federal tax provision                 22,844 33,580 21,843
State and Local:                      
State and local tax provision, current                 1,419 7,647 7,059
State and local tax provision, deferred                 750 (124) (1,735)
Total state and local tax provision                 2,169 7,523 5,324
Total income tax provision $ 7,693 $ 5,291 $ 6,775 $ 5,254 $ 8,116 $ 6,655 $ 20,717 $ 5,615 $ 25,013 $ 41,103 $ 27,167