Note 6 - Components of Coal Workers' Pneumoconiosis (CWP) and Workers' Compensation Net Periodic Benefit Costs (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Schedule of Changes in Accumulated Postemployment Benefit Obligations [Table Text Block]

	CWP								Workers' Compensation
	Three Months Ended				Six Months Ended				Three Months Ended						Six Months Ended
	June 30,				June 30,				June 30,						June 30,
	2021		2020		2021		2020		2021			2020			2021			2020
Service Cost	$	1,115	$	1,151	$	2,230	$	2,302	$	1,059		$	1,569		$	2,118		$	3,138
Interest Cost		1,177		1,552		2,355		3,103		282			461			564			922
Amortization of Actuarial Loss (Gain)		2,091		1,401		4,182		2,802		(45	)		(122	)		(90	)		(244	)
State Administrative Fees and Insurance Bond Premiums		—		—		—		—		444			461			912			1,082
Net Periodic Benefit Cost	$	4,383	$	4,104	$	8,767	$	8,207	$	1,740		$	2,369		$	3,504		$	4,898