Note 10 - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current U.S. Federal	$ 1,249	$ 10,214	$ 38,033
Deferred U.S. Federal	43,270	32,176	(91,271)
U.S. Federal	44,519	42,390	(53,238)
Current State and Local	3,678	2,284	4,164
Deferred State and Local	7,036	2,550	4,046
State and local	10,714	4,834	8,210
Total	4,927	12,498	42,197
Total	50,306	34,726	(87,225)
Total	$ 55,233	$ 47,224	$ (45,028)