5. Stock Option Plan (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 29, 2019	Mar. 30, 2018
Options exercisable, weighted average remaining contractual term	5 years 8 months 19 days
Options outstanding, weighted average remaining contractual term	6 years 6 months 14 days
Options, Exercisable, Aggregate Intrinsic Value	$ 69
Total unrecognized share-based compensation cost	$ 122
Total unrecognized share-based compensation, compensation cost not yet recognized, weighted-average period	2 years 15 days
Allocated Share-based Compensation Expense	$ 26	$ 39
Stock Option Plan
Number of Shares Authorized	876,981

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

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