Note 4 - Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended March 31,
	2021			2020
Service cost	$	1,455		$	1,334
Interest cost		1,248			1,404
Expected return on plan assets		(2,313	)		(1,872	)
Amortization of prior service cost		99			29
Amortization of net loss		1,125			1,163
Net periodic pension cost	$	1,614		$	2,058