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SHARE-BASED COMPENSATION- Stock Options and Restricted Stock (Details) - USD ($)		12 Months Ended
	May 31, 2018	Dec. 30, 2018	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015	Dec. 30, 2018	May 25, 2018	Dec. 31, 2017	May 16, 2017	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capital shares reserved for future issuance						864,516
Shares issued, price per share							$ 18.00
Option cancellation agreement		$ (3,335,169)	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised		(86,053)	(13,800)	(87,655)
Options exercisable (in shares)						238,085		498,611
Common Stock, Shares Outstanding						10,227,247		8,759,376
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options exercisable at beginning of period (in dollars per share) (in shares)		$ 13.96	$ 8.74			$ 13.96		$ 8.74
Options exercisable at ending of period (in dollars per share) (in shares)		$ 13.96	$ 8.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable, weighted average remaining contractual term		7 years 2 months 12 days	6 years 9 months 15 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]
Options exercisable at beginning of period		$ 1,684,000	$ 3,640,000			$ 1,684,000		$ 3,640,000
Options exercisable at ending of period		1,684,000	3,640,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to stock awards		$ 1,100,000	$ 400,000	$ 300,000
Unamortized stock compensation expense						$ 1,300,000
Unamortized stock compensation expense, recognition period		3 years 2 days
Conversion of stock, shares issued		49,541	5,221	55,974
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average fair value of warrants		$ 12.27	$ 3.94	$ 4.05
Weighted-average risk-free interest rate		2.70%	1.80%	1.10%
Weighted-average dividend yield		100.00%	100.00%	100.00%
Weighted-average volatility factor		42.30%	43.20%	43.20%
Weighted-average expected life		8 years 7 months 24 days	6 years	6 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning of period (in shares)		765,411	678,411	775,666
Granted		217,000	128,000	50,000
Exercised		(163,338)	(28,800)	(103,055)
Forfeited / Canceled		(292,088)	(12,200)	(44,200)
Options outstanding at ending of period (in shares)		526,985	765,411	678,411	775,666
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options outstanding at beginning of period (in dollars per share)		$ 10.27	$ 8.95	$ 8.19
Granted		20.73	16.76	17.46
Exercised		10.47	7.71	6.91
Forfeited / Canceled		6.71	11.00	9.94
Options outstanding at ending of period (in dollars per share)		$ 16.49	$ 10.27	$ 8.95	$ 8.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, weighted average remaining contractual term		7 years 8 months 19 days	7 years 3 months 7 days	7 years 10 months 6 days	8 years 8 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]
Options outstanding at beginning of period		$ 4,521,000	$ 4,511,000	$ 5,246,000
Options outstanding at ending of period		2,932,000	4,521,000	4,511,000	$ 5,246,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested, number of shares						288,900		266,800
Nonvested options, weighted average grant date fair value						$ 8.34		$ 3.09
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to stock awards		$ 400,000	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Common Stock, Shares Outstanding						31,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Granted		$ 28.61
Long Term Incentive Plan 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capital shares reserved for future issuance										900,000
Additional capital shares reserved for future issuance									250,000
Long Term Incentive Plan 2013 | Vested Immediately
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, percentage		20.00%
Long Term Incentive Plan 2013 | Vesting Over Four Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, percentage		20.00%
Long Term Incentive Plan 2013 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period, options (in years)		10 years
Chief Executive Officer | Cancellation Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, price per share	$ 18.00
Option cancellation agreement	$ 3,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Forfeited / Canceled	(284,888)

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