3. Operating Lease: Schedule of lease expense (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018
Notes to Financial Statements
Amortization of right-of-use asset recorded as rent expense	$ 246	$ 270
Interest on lease liability included in other expense	15	19
Total lease cost	$ 261	$ 289