Note 3 - Miscellaneous Other Income - Miscellaneous Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Contract Buyout	$ 30,144	$ 1,342	$ 40,969	$ 2,390
Royalty Income - Non-Operated Coal	2,893	5,677	7,397	11,887
Property Easements and Option Income	413	450	476	1,429
Rental Income	325	681	822	1,298
Interest Income	122	757	366	1,644
Purchased Coal Sales	0	2,730	0	5,916
Other	39	557	76	922
Miscellaneous Other Income	$ 33,936	$ 12,194	$ 50,106	$ 25,486