SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Weighted Average Shares - (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Earnings per Common Share
Basic weighted average outstanding shares	13,809	13,731	13,717	12,695	10,162	10,172	10,158	10,089	13,539	10,153	9,505
Dilutive effect of outstanding compensation awards									218	193	240
Diluted (in shares)	14,014	13,941	13,954	12,937	10,330	10,310	10,322	10,260	13,757	10,346	9,745
Stock options excluded from computation of diluted EPS (in shares)									58	76	20
Advertising Costs
Advertising expense									$ 643	$ 403	$ 393