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Share-Based Compensation - Non-vested stock options (Details) - Options
 12 Months Ended
Jan. 02, 2021
$ / shares
shares
Options, Number of Shares  
Non-vested balance at the beginning of the period (in shares) | shares 36,212
Granted (in shares) | shares 0
Vested (in shares) | shares (19,299)
Forfeited (in shares) | shares 0
Non-vested balance at the end of the period (in shares) | shares 16,913
Options, Weighted-Average Grant Date Fair Value  
Non-vested balance at the beginning of the period (in dollars per share) | $ / shares $ 14.80
Granted (in dollars per share) | $ / shares 0
Vested (in dollars per share) | $ / shares 12.76
Forfeited (in dollars per share) | $ / shares 0
Non-vested balance at the end of the period (in dollars per share) | $ / shares $ 17.13