Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 26, 2018	Sep. 27, 2017
Cash flows from operating activities:
Net income	$ 14,416,000	$ 8,657,000
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	13,063,000	13,646,000
Stock-based compensation expense	1,547,000	738,000
Income tax receivable agreement (income) expense	(777,000)	107,000
Loss on disposal of assets	193,000	724,000
Impairment of property and equipment	1,791,000	15,480,000
Closed-store reserve expense	4,838,000	1,813,000
Amortization of deferred financing costs	217,000	228,000
Amortization of favorable and unfavorable leases, net	(37,000)	(88,000)
Deferred income taxes, net	3,825,000	5,066,000
Changes in operating assets and liabilities:
Accounts and other receivables, net	(1,675,000)	(1,075,000)
Inventories	46,000	(121,000)
Prepaid expenses and other current assets	229,000	88,000
Other assets	113,000	28,000
Accounts payable	(2,206,000)	747,000
Accrued salaries and vacation	2,560,000	3,561,000
Accrued insurance	895,000	104,000
Income taxes payable	(33,000)	(117,000)
Other accrued expenses and liabilities	2,596,000	2,499,000
Restricted cash	0	125,000
Net cash flows provided by operating activities	41,601,000	52,210,000
Cash flows from investing activities:
Purchase of property and equipment	(20,711,000)	(28,295,000)
Net cash flows used in investing activities	(20,711,000)	(28,295,000)
Cash flows from financing activities:
Minimum tax withholdings related to net share settlements	(79,000)	0
Payments on revolver loan	(29,000,000)	(19,000,000)
Borrowings on revolver loan	6,307,000	0
Deferred financing costs on revolver loan	(138,000)	0
Proceeds from issuance of common stock upon exercise of stock options, net of expenses	1,710,000	93,000
Payment of obligations under capital leases	(98,000)	(114,000)
Net cash flows used in financing activities	(21,298,000)	(19,021,000)
(Decrease) increase in cash and cash equivalents	(408,000)	4,894,000
Cash and cash equivalents, beginning of period	8,550,000	2,168,000
Cash and cash equivalents, end of period	8,142,000	7,062,000
Supplemental cash flow information
Cash paid during the period for interest	2,623,000	2,475,000
Cash paid during the period for income taxes	125,000	320,000
Unpaid purchases of property and equipment	1,449,000	3,131,000
Schedule of Non-cash Transactions
Borrowing on Revolver for Financing Fees	$ 693	$ 0