Note 7 - Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended September 30,
	2020			2019
Service cost	$	1,334		$	1,100
Interest cost		1,404			1,620
Expected return on plan assets		(1,872	)		(1,496	)
Amortization of prior service cost		29			15
Amortization of net loss		1,163			1,097
Net periodic pension cost	$	2,058		$	2,336

	Nine Months Ended September 30,
	2020			2019
Service cost	$	4,002		$	3,300
Interest cost		4,212			4,860
Expected return on plan assets		(5,616	)		(4,488	)
Amortization of prior service cost		87			45
Amortization of net loss		3,489			3,291
Net periodic pension cost	$	6,174		$	7,008