Note 8 - Accrued Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	March 31			December 31,
	2019			2018
	(in thousands)
Defined benefit pension plans	$	7,987		$	7,971
Non-qualified retirement plans		2,067			2,065
Total		10,054			10,036
Less current portion		(165	)		(165	)
Non-current portion of accrued retirement benefits	$	9,889		$	9,871

Schedule of Net Benefit Costs [Table Text Block]

	Three Months
	Ended March 31,
	2019			2018
	(in thousands)
Interest cost	$	527		$	495
Expected return on plan assets		(485	)		(578	)
Amortization of net loss		211			185
Pension and other postretirement expenses	$	253		$	102