Note 7 - Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended March 31,
	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