Note 10 - Employee Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Pension benefits												Postretirement benefits
	Three months ended						Nine months ended						Three months ended						Nine months ended
	September 30,						September 30,						September 30,						September 30,
	2021			2020			2021			2020			2021			2020			2021			2020
Service cost	$	32		$	29		$	96		$	87		$	3		$	2		$	8		$	7
Interest cost		22			32			65			94			3			5			11			15
Expected return on plan assets		(54	)		(49	)		(162	)		(147	)
Amortization of prior service cost (credit)		1			1			3			4			(1	)		(2	)		(4	)		(5	)
Recognition of actuarial loss (gain)								10			(2	)					1			1			1
Total pension and postretirement benefit expense	$	1		$	13		$	12		$	36		$	5		$	6		$	16		$	18