Note 5 - Components of Coal Workers' Pneumoconiosis (CWP) and Workers' Compensation Net Periodic Benefit Costs (Tables)

3 Months Ended

Mar. 31, 2022

Coal Workers Pneumoconiosis and Workers' Compensation [Member]

Notes Tables

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	CWP				Workers' Compensation
	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2022		2021		2022			2021
Service Cost	$	726	$	1,115	$	1,230		$	1,059
Interest Cost		1,265		1,178		342			282
Amortization of Actuarial Loss (Gain)		1,060		2,091		(105	)		(45	)
State Administrative Fees and Insurance Bond Premiums		—		—		437			468
Net Periodic Benefit Cost	$	3,051	$	4,384	$	1,904		$	1,764