Share-Based Compensation - Non-vested stock options (Details) - Options	12 Months Ended
	Dec. 28, 2019 $ / shares shares
Options, Number of Shares
Non-vested balance at the beginning of the period (in shares) | shares	116,284
Vested (in shares) | shares	(79,093)
Forfeited (in shares) | shares	(979)
Non-vested balance at the end of the period (in shares) | shares	36,212
Options, Weighted-Average Grant Date Fair Value
Non-vested balance at the beginning of the period (in dollars per share) | $ / shares	$ 10.64
Vested (in dollars per share) | $ / shares	8.77
Forfeited (in dollars per share) | $ / shares	7.37
Non-vested balance at the end of the period (in dollars per share) | $ / shares	$ 14.80