5. Stock Option Plan (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 28, 2019	Jun. 29, 2018
Options exercisable, weighted average remaining contractual term	5 years 6 months
Options outstanding, weighted average remaining contractual term	6 years 3 months 19 days
Options outstanding, Aggregate Intrinsic Value	$ 341
Options, Exercisable, Aggregate Intrinsic Value	69
Total unrecognized share-based compensation cost	$ 99
Total unrecognized share-based compensation, compensation cost not yet recognized, weighted-average period	2 years 2 months 12 days
Allocated Share-based Compensation Expense	$ 49	$ 46
Stock Option Plan
Number of Shares Authorized	876,581

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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