Note 5 - Components of Pension and Other Post-employment Benefit (OPEB) Plans Net Periodic Benefit Costs (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	Pension Benefits												Other Post-Employment Benefits
	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	$	279		$	295		$	558		$	591		$	—		$	—		$	—		$	—
Interest Cost		3,554			5,044			7,104			10,088			1,819			3,199			3,637			6,398
Expected Return on Plan Assets		(10,542	)		(10,455	)		(21,084	)		(20,910	)		—			—			—			—
Amortization of Prior Service Credits		—			—			—			—			(601	)		(602	)		(1,202	)		(1,203	)
Amortization of Actuarial Loss		1,367			1,731			2,734			3,461			1,629			2,320			3,258			4,639
Settlement Loss Recognized		22			—			22			—			—			—			—			—
Net Periodic Benefit (Credit) Cost	$	(5,320	)	$	(3,385	)	$	(10,666	)	$	(6,770	)	$	2,847		$	4,917		$	5,693		$	9,834