Note 5 - Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months				Nine Months
	Ended				Ended
	Sept. 30 ,		Oct. 1 ,		Sept. 30 ,		Oct. 1 ,
	201 7		201 6		201 7		201 6
Interest cost	$	59	$	64	$	176	$	191
Amortization of actuarial loss		30		24		81		71
Net p eriodic postretirement benefit cost	$	89	$	88	$	257	$	262