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

9 Months Ended

Sep. 30, 2020

Notes Tables

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

	CWP								Workers' Compensation
	Three Months Ended				Nine Months Ended				Three Months Ended						Nine Months Ended
	September 30,				September 30,				September 30,						September 30,
	2020		2019		2020		2019		2020			2019			2020			2019
Service Cost	$	1,150	$	948	$	3,452	$	2,844	$	1,569		$	1,421		$	4,707		$	4,264
Interest Cost		1,552		1,750		4,655		5,250		461			646			1,383			1,939
Amortization of Actuarial Loss (Gain)		1,401		254		4,203		762		(122	)		(193	)		(366	)		(580	)
State Administrative Fees and Insurance Bond Premiums		—		—		—		—		583			510			1,665			1,671
Net Periodic Benefit Cost	$	4,103	$	2,952	$	12,310	$	8,856	$	2,491		$	2,384		$	7,389		$	7,294