Note 11 - Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Property, Plant and Equipment [Table Text Block]

	March 31,		December 31,
	2021		2020
Plant and Equipment	$	3,118,268	$	3,134,149
Coal Properties and Surface Lands		875,079		874,567
Airshafts		456,083		452,976
Mine Development		356,136		354,691
Advance Mining Royalties		326,173		327,313
Total Property, Plant and Equipment		5,131,739		5,143,696
Less: Accumulated Depreciation, Depletion and Amortization		3,117,651		3,094,634
Total Property, Plant and Equipment, Net	$	2,014,088	$	2,049,062