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SUPPLEMENTAL FINANCIAL STATEMENT DATA - Equipment And Leasehold Improvements, Net (Details) - USD ($)	12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
EQUIPMENT AND LEASEHOLD IMPROVEMENTS
Equipment and leasehold improvements, gross	$ 27,334,000	$ 19,783,000
Accumulated depreciation and amortization	(15,283,000)	(11,785,000)
Total equipment and leasehold improvements, net	12,051,000	7,998,000
Depreciation	3,400,000	1,600,000	$ 1,500,000
Furniture and fixtures
EQUIPMENT AND LEASEHOLD IMPROVEMENTS
Equipment and leasehold improvements, gross	4,614,000	3,551,000
Computer hardware and software
EQUIPMENT AND LEASEHOLD IMPROVEMENTS
Equipment and leasehold improvements, gross	14,789,000	10,874,000
Leasehold improvements
EQUIPMENT AND LEASEHOLD IMPROVEMENTS
Equipment and leasehold improvements, gross	2,410,000	1,419,000
Equipment under finance lease
EQUIPMENT AND LEASEHOLD IMPROVEMENTS
Equipment and leasehold improvements, gross	1,957,000	1,304,000
Accumulated depreciation and amortization	(509,000)
Automobiles, trucks, and field equipment
EQUIPMENT AND LEASEHOLD IMPROVEMENTS
Equipment and leasehold improvements, gross	$ 3,564,000	2,635,000
Equipment under capital leases
EQUIPMENT AND LEASEHOLD IMPROVEMENTS
Accumulated depreciation and amortization		$ (374,000)	$ (380,000)

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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