Note 7 - Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended June 30,
	2019			2018
Service cost	$	1,100		$	1,252
Interest cost		1,620			1,377
Expected return on plan assets		(1,496	)		(1,634	)
Amortization of prior service cost		15			15
Amortization of net loss		1,097			931
Net periodic pension cost	$	2,336		$	1,941

	Six Months Ended June 30,
	2019			2018
Service cost	$	2,200		$	2,504
Interest cost		3,240			2,754
Expected return on plan assets		(2,992	)		(3,268	)
Amortization of prior service cost		30			30
Amortization of net (gain) loss		2,194			1,862
Net periodic pension cost	$	4,672		$	3,882