Note 10 - Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Property, Plant and Equipment [Table Text Block]

	March 31,		December 31,
	2022		2021
Plant and Equipment	$	3,252,874	$	3,213,512
Coal Properties and Surface Lands		876,794		877,271
Airshafts		476,588		473,866
Mine Development		358,909		357,479
Advance Mining Royalties		328,740		328,677
Total Property, Plant and Equipment		5,293,905		5,250,805
Less: Accumulated Depreciation, Depletion and Amortization		3,323,580		3,272,255
Total Property, Plant and Equipment, Net	$	1,970,325	$	1,978,550