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

3 Months Ended

Mar. 31, 2021

Notes Tables

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

	CWP				Workers' Compensation
	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2021		2020		2021			2020
Service Cost	$	1,115	$	1,151	$	1,059		$	1,569
Interest Cost		1,178		1,551		282			461
Amortization of Actuarial Loss (Gain)		2,091		1,401		(45	)		(122	)
State Administrative Fees and Insurance Bond Premiums		—		—		468			621
Net Periodic Benefit Cost	$	4,384	$	4,103	$	1,764		$	2,529