Note 10 - Employee Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Pension benefits						Postretirement benefits
	Three months ended						Three months ended
	March 31,						March 31,
	2021			2020			2021			2020
Service cost	$	32		$	29		$	2		$	2
Interest cost		22			31			4			5
Expected return on plan assets		(54	)		(49	)
Amortization of prior service cost (credit)		1			1			(1	)		(1	)
Total pension and postretirement benefit expense	$	1		$	12		$	5		$	6