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Quarterly Financial Data (Unaudited) - Schedule Of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Quarterly Financial Data [Abstract]
Net sales	$ 31,186	$ 31,770	$ 33,905	$ 27,093	$ 24,852	$ 23,473	$ 21,936	$ 20,350	$ 123,954	$ 90,611	$ 82,432
Gross profit	22,992	23,860	25,227	19,431	17,380	16,849	15,474	14,577	91,510	64,280	58,369
Net income (loss)	$ 1,096	$ 1,459	$ 1,830	$ 583	$ (138)	$ 1,173	$ (971)	$ (2,203)	$ 4,968	$ (2,139)	$ (12,129)
Net income (loss) per share – basic and diluted	$ 0.02	$ 0.03	$ 0.04	$ 0.01	$ 0.00	$ 0.03	$ (0.02)	$ (0.05)

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- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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