Note 4 - Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended March 31,
	2022			2021
Service cost	$	1,566		$	1,455
Interest cost		1,369			1,248
Expected return on plan assets		(3,363	)		(2,313	)
Amortization of prior service cost		128			99
Amortization of net loss		512			1,125
Net periodic pension cost	$	212		$	1,614