Note 11 - Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Property, Plant and Equipment [Table Text Block]

	June 30,		December 31,
	2021		2020
Plant and Equipment	$	3,150,799	$	3,134,149
Coal Properties and Surface Lands		876,297		874,567
Airshafts		461,804		452,976
Mine Development		356,172		354,691
Advance Mining Royalties		326,161		327,313
Total Property, Plant and Equipment		5,171,233		5,143,696
Less: Accumulated Depreciation, Depletion and Amortization		3,168,407		3,094,634
Total Property, Plant and Equipment, Net	$	2,002,826	$	2,049,062