Note 8 - Income Taxes - Federal and State Income Tax Expense (Benefit) Summary (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal		$ 42,531	$ 4,633	$ 0
State and local		11,447	3,261	2,730
State and local - reserve for uncertain tax positions		(63)	757	(698)
Current income tax expense		53,915	8,651	2,032
Federal(1)	[1]	17,385	(81,666)	38,214
State and local		5,547	4,341	3,172
Deferred income tax expense (benefit)		22,932	(77,325)	41,386
Income tax expense (benefit) as recorded		$ 76,847	$ (68,674)	$ 43,418

[1] Includes a federal tax benefit of $146.0 million from the restatement of deferred taxes resulting from the reduction of the corporate tax rate due to the enactment of the TCJA.