Note 4 - Components of Pension and Other Post-employment Benefit (OPEB) Plans Net Periodic Benefit Costs (Tables)

6 Months Ended

Jun. 30, 2020

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,
	2020			2019			2020			2019			2020			2019			2020			2019
Service Cost	$	295		$	987		$	591		$	1,975		$	—		$	—		$	—		$	—
Interest Cost		5,044			6,275			10,088			12,551			3,199			4,580			6,398			9,160
Expected Return on Plan Assets		(10,455	)		(10,114	)		(20,910	)		(20,229	)		—			—			—			—
Amortization of Prior Service Credits		—			(92	)		—			(183	)		(602	)		(601	)		(1,203	)		(1,203	)
Amortization of Actuarial Loss		1,731			1,490			3,461			2,979			2,320			2,315			4,639			4,631
Net Periodic Benefit (Credit) Cost	$	(3,385	)	$	(1,454	)	$	(6,770	)	$	(2,907	)	$	4,917		$	6,294		$	9,834		$	12,588