STOCK-BASED COMPENSATION (Details) - USD ($)	6 Months Ended
	Jul. 01, 2017	Dec. 31, 2016	May 25, 2016
Stock-based compensation, additional disclosure
Total unrecognized compensation expense	$ 2,100,000
Recognition of unrecognized compensation expense over weighted average contractual life	2 years 2 months 12 days
Shares reserved for the grant of future share-based awards	910,273	1,012,140
Director [Member]
Stock-based compensation, additional disclosure
Annual stock award paid as compensation to outside directors	$ 40,000
Stock-based compensation expense	$ 140,000
Employee And Nonemployee Stock Option
Options
Outstanding at the beginning of the period(in shares)	17,850
Exercised (in shares)	(17,850)
Weighted - Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 2.12
Exercised (in dollars per share)	$ 2.12
Employee And Nonemployee Stock Option | 2016 Plan | Common Class A
Stock-based compensation, additional disclosure
Shares available for grant			1,000,000
Employee And Nonemployee Stock Option | 2016 Plan | Common Class A | Maximum
Stock-based compensation, additional disclosure
Number of shares that can be granted in any one year	100,000
Restricted Stock [Member]
Number of Shares
Unvested at the beginning of the period (in shares)	129,666
Granted (in shares)	77,495
Vested (in shares)	(49,594)
Unvested at the end of the period (in shares)	157,567
Weighted - Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share)	$ 8.12
Granted (in dollars per share)	19.54
Vested (in dollars per share)	10.10
Unvested at the end of the period (in dollars per share)	$ 13.11
Total fair value of shares vested and recognized as stock-based compensation expense during the year	$ 500,917