Note 8 - Accrued Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	March 31,			December 31,
	2021			2020
	(unaudited)			(audited)
	(in thousands)
Defined benefit pension plan	$	8,112		$	8,790
Non-qualified retirement plans		2,285			2,301
Total		10,397			11,091
Less current portion		(165	)		(165	)
Non-current portion of accrued retirement benefits	$	10,232		$	10,926

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended
	March 31,
	(unaudited)
	2021			2020
	(in thousands)
Interest cost	$	309		$	408
Expected return on plan assets		(414	)		(497	)
Amortization of net actuarial loss		221			206
Pension and other postretirement expenses	$	116		$	117