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Note 10 - Income Taxes - Income Tax Provisions (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal tax provision, current									$ 9,183	$ 14,859	$ 34,996
Federal tax provision, deferred									(609)	7,985	(1,416)
Total federal tax provision									8,574	22,844	33,580
State and local tax provision, current									3,876	1,419	7,647
State and local tax provision, deferred									(2,055)	750	(124)
Total state and local tax provision									1,821	2,169	7,523
Total income tax provision	$ 1,046	$ 1,910	$ 4,489	$ 2,950	$ 7,693	$ 5,291	$ 6,775	$ 5,254	$ 10,395	$ 25,013	$ 41,103

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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