Note 8 - Employee Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Pension benefits												Postretirement benefits
	Three months ended						Six months ended						Three months ended						Six months ended
	June 30,						June 30,						June 30,						June 30,
	2022			2021			2022			2021			2022			2021			2022			2021
Service cost	$	32		$	32		$	64		$	64		$	2		$	3		$	4		$	5
Interest cost		27			21			54			43			4			4			8			8
Expected return on plan assets		(54	)		(54	)		(109	)		(108	)
Amortization of prior service cost (credit)		2			1			3			2			(1	)		(2	)		(2	)		(3	)
Recognition of actuarial loss (gain)		22			10			22			10			(1	)		1			(1	)		1
Total pension and postretirement benefit expense	$	29		$	10		$	34		$	11		$	4		$	6		$	9		$	11