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Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Apr. 02, 2022
Apr. 03, 2021
Numerator:    
Net income — basic $ 11,426 $ 10,501
Less: net income attributable to participating shares 48 46
Net income — diluted $ 11,378 $ 10,455
Denominator:    
Weighted average shares outstanding — basic (in shares) 7,360,000 7,626,000
Effect of dilutive stock options and restricted stock units (in shares) 143,000 205,000
Weighted average shares outstanding — diluted (in shares) 7,503,000 7,831,000
Basic (in dollars per share) $ 1.55 $ 1.37
Diluted (in dollars per share) $ 1.52 $ 1.34
Calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding    
Anti-dilutive share-based awards excluded (in shares) 0 14,000