Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 25, 2020
Cash flows from operating activities:
Net income	$ 3,964	$ 3,600
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	3,938	4,369
Stock-based compensation expense	853	534
Income tax receivable agreement income	(77)	(120)
Loss on disposal of assets	26	100
Impairment of property and equipment	303	1,920
Amortization of deferred financing costs	62	63
Deferred income taxes, net	(310)	916
Changes in operating assets and liabilities:
Accounts and other receivables	(1,055)	(3,569)
Inventories	172	(83)
Prepaid expenses and other current assets	(572)	1,111
Income taxes receivable/payable	1,907	38
Other assets	(101)	201
Accounts payable	2,811	490
Accrued salaries and vacation	(3,444)	(999)
Accrued insurance	234	442
Other accrued expenses and liabilities	(1,313)	(16,539)
Net cash flows provided by (used in) operating activities	7,398	(7,526)
Cash flows from investing activities:
Purchase of property and equipment	(5,257)	(1,632)
Net cash flows used in investing activities	(5,257)	(1,632)
Cash flows from financing activities:
Proceeds from borrowings on revolver and swingline loans		52,500
Payments on revolver and swingline loan	(9,000)	(8,000)
Proceeds from issuance of common stock upon exercise of stock options, net of expenses	326
Payment of obligations under finance leases	(17)	(8)
Net cash flows (used in) provided by financing activities	(8,691)	44,492
Increase (decrease) in cash and cash equivalents	(6,550)	35,334
Cash and cash equivalents, beginning of period	13,219	8,070
Cash and cash equivalents, end of period	6,669	43,404
Supplemental cash flow information
Cash paid during the period for interest	334	1,112
Unpaid purchases of property and equipment	$ 1,172	$ 1,085