4. Changes in Accounting Principal (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 28, 2018	Dec. 31, 2018	Sep. 27, 2019	Jan. 02, 2018
Notes to Financial Statements
Stockholders' equity		$ 8,373	$ 7,224	$ 808
Increase rent expense	$ 330
Increase stockholders' equity		$ 369

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Amount of increase (decrease) of consideration paid in advance for rent that provides economic benefits in future periods.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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The increase (decrease) in stockholders' equity during the period.

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