Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 2,115	$ 3,964
Adjustments to reconcile net income to net cash flows (used in) provided by operating activities:
Depreciation and amortization	3,597	3,938
Stock-based compensation expense	826	853
Income tax receivable agreement income	(130)	(77)
Loss on disposal of assets	66	26
Impairment of property and equipment	89	303
Amortization of deferred financing costs	63	62
Deferred income taxes, net	(1,039)	(310)
Changes in operating assets and liabilities:
Accounts and other receivables	(645)	(1,055)
Inventories	(45)	172
Prepaid expenses and other current assets	(867)	(572)
Income taxes payable	1,938	1,907
Other assets	(357)	(101)
Accounts payable	(846)	2,811
Accrued salaries and vacation	(5,302)	(3,444)
Accrued insurance	396	234
Other accrued expenses and liabilities	(2,164)	(1,313)
Net cash flows (used in) provided by operating activities	(2,305)	7,398
Cash flows from investing activities:
Purchase of property and equipment	(3,772)	(5,257)
Net cash flows used in investing activities	(3,772)	(5,257)
Cash flows from financing activities:
Payments on revolver and swingline loan		(9,000)
Proceeds from issuance of common stock upon exercise of stock options, net of expenses	1,530	326
Payment of obligations under finance leases	(48)	(17)
Net cash flows provided by (used in) financing activities	1,482	(8,691)
Decrease in cash and cash equivalents	(4,595)	(6,550)
Cash and cash equivalents, beginning of period	30,046	13,219
Cash and cash equivalents, end of period	25,451	6,669
Supplemental cash flow information
Cash paid during the period for interest	236	334
Cash paid during the period for income taxes	5
Unpaid purchases of property and equipment	$ 2,725	$ 1,172