NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Assets (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) item	Jan. 02, 2016 USD ($)
Amortizable intangible assets
Goodwill impairment charges recognized	$ 0	$ 0
Other Assets, Noncurrent	$ 3,674,000	$ 2,601,000
Number of aggregate property leases which require royalty payments to which the entity is a party | item	3
Recovery amount due pending outcome of litigation	$ 627,000
Aggregate property near Colorado Springs [Member]
Amortizable intangible assets
Other Assets, Noncurrent	$ 2,500,000
Restrictive land covenant [Member]
Amortizable intangible assets
Useful lives of intangible assets	10 years
Customer relationships [Member]
Amortizable intangible assets
Useful lives of intangible assets	10 years