Net Income per Share - General (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Net income available to common shareholders
Net income, as reported	$ 3,193	$ 2,860	$ 10,830	$ 8,964
Less: net income attributable to participating shares	24	22	74	69
Net income available to common shareholders	$ 3,169	$ 2,838	$ 10,756	$ 8,895
Reconciliation of basic to diluted weighted average shares of common stock outstanding
Basic weighted average shares outstanding	8,177,000	8,940,000	8,581,000	9,055,000
Stock options, restricted shares, and restricted stock units (in shares)	132,000	85,000	72,000	127,000
Diluted weighted average shares outstanding	8,309,000	9,025,000	8,653,000	9,182,000
Calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding
Anti-dilutive securities excluded from EPS computation (in shares)	205,015	431,992	680,950	398,382