Note 4 - Other Long-term Assets (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Other Assets, Noncurrent [Table Text Block]

	September 30,		December 31,
	2020		2019
Advanced coal royalties	$	6,453	$	6,105
Marketable equity securities available for sale, at fair value (restricted)*		—		2,296
Other		1,837		1,923
Total other assets	$	8,290	$	10,324