Quarterly Financial Information (Unaudited Supplemental Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Jan. 02, 2015	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Jan. 01, 2016	Jan. 02, 2015	Dec. 27, 2013
Consolidated Statements of Operations [Abstract]
Total revenue	$ 60,261	$ 59,992	$ 59,423	$ 54,905	$ 54,551	$ 54,550	$ 55,000	$ 49,418	$ 260,940	$ 236,737	$ 223,830
Operating income	6,298	4,943	6,049	4,635	4,224	3,986	3,966	410	21,925	12,586	15,727
Income from continuing operations	6,237	4,842	5,940	4,497	4,063	3,815	3,801	287	13,809	9,711	8,864
Net income	$ 4,055	$ 3,058	$ 3,691	$ 3,005	$ 3,542	$ 2,936	$ 2,828	$ 405	$ 13,809	$ 9,711	$ 8,729
Basic net income per common share	$ 0.14	$ 0.11	$ 0.13	$ 0.11	$ 0.13	$ 0.10	$ 0.10	$ 0.01	$ 0.47	$ 0.34	$ 0.29
Diluted net income per common share	$ 0.12	$ 0.10	$ 0.12	$ 0.10	$ 0.12	$ 0.10	$ 0.09	$ 0.01	$ 0.43	$ 0.33	$ 0.27

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (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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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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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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