Note 10 - Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Property, Plant and Equipment [Table Text Block]

	December 31,
	2021		2020
Plant and Equipment	$	3,213,512	$	3,134,149
Coal Properties and Surface Lands		877,271		874,567
Airshafts		473,866		452,976
Mine Development		357,479		354,691
Advance Mining Royalties		328,677		327,313
Total Property, Plant and Equipment		5,250,805		5,143,696
Less: Accumulated Depreciation, Depletion and Amortization		3,272,255		3,094,634
Total Property, Plant and Equipment - Net	$	1,978,550	$	2,049,062