Note 4 - Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2022			2021			2022			2021
Service cost	$	1,566		$	1,455		$	3,131		$	2,910
Interest cost		1,369			1,248			2,738			2,496
Expected return on plan assets		(3,363	)		(2,313	)		(6,726	)		(4,626	)
Amortization of prior service cost		128			99			256			198
Amortization of net loss		512			1,125			1,024			2,250
Net periodic pension cost	$	212		$	1,614		$	423		$	3,228