Debt - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 27, 2020	Mar. 29, 2019	Dec. 31, 2019
Line of Credit Facility [Line Items]
Long-term debt	$ 12,000,000		$ 5,290,000
Maximum amount outstanding	12,000,000.0	$ 18,000,000.0
Average amount outstanding	$ 3,100,000	$ 10,300,000
Weighted-average interest rate	2.50%	3.00%
Debt covenants, Maximum leverage ratio	1.10%
Debt covenants, Minimum tangible net worth	$ 5,000,000.0
Debt covenants, Maximum capital expenditures	5,000,000.0
Debt covenants threshold limit to test fixed charge coverage ratio	5,625,000
Total available borrowings	5,400,000
Debt covenants, EBITDA	$ 12,900,000
Fixed charge coverage ratio	35.0
Capital expenditures	$ 700,000
Federal Funds Effective Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Minimum [Member] | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.50%
Minimum [Member] | Adjusted London Interbank Offered Rate L I B O R
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Maximum [Member] | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.00%
Maximum [Member] | Adjusted London Interbank Offered Rate L I B O R
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Credit and Security Agreement [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, term	3 years
Line of Credit Facility, Maximum Borrowing Capacity	$ 45,000,000.0
Line of credit facility, expiration date	2022-12
Letters of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 10,000,000.0
Swing Line Loans [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 10,000,000.0