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SHARE-BASED COMPENSATION- Stock Options and Restricted Stock (Details) - USD ($)		12 Months Ended
	May 31, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017	Dec. 27, 2015	Dec. 29, 2019	Dec. 30, 2018	May 16, 2017	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capital shares reserved for future issuance						838,739
Shares issued, price per share (in dollars per share)	$ 18.00
Option cancellation agreement		$ 0	$ (3,335,169)	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised (in shares)		(39,014)	(86,053)	(13,800)
Options exercisable (in shares)						313,645	238,085
Common stock, shares outstanding (in shares)						10,309,236	10,227,247
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)		$ 16.05	$ 13.96			$ 16.05	$ 13.96
Options exercisable at ending of period (in dollars per share) (in shares)		$ 16.05	$ 13.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable, weighted average remaining contractual term		6 years 9 months 18 days	7 years 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]
Options exercisable at beginning of period		$ 1,991,000	$ 1,684,000			$ 1,991,000	$ 1,684,000
Options exercisable at ending of period		1,991,000	1,684,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to stock awards		$ 1,000,000.0	$ 1,100,000	$ 400,000
Unamortized stock compensation expense						$ 1,800,000
Unamortized stock compensation expense, recognition period		2 years 8 months 12 days
Conversion of stock, shares issued (in shares)		16,777	49,541	5,221
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average fair value of warrants		$ 6.12	$ 12.27	$ 3.94
Weighted-average risk-free interest rate		2.30%	2.70%	1.80%
Weighted-average dividend yield		118.00%	104.00%	100.00%
Weighted-average volatility factor		42.60%	42.30%	43.20%
Weighted-average expected life		10 years	8 years 7 months 6 days	6 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning of period (in shares)		526,985	765,411	678,411
Granted (in shares)		138,750	217,000	128,000
Exercised (in shares)		(48,190)	(163,338)	(28,800)
Forfeited / Canceled (in shares)		(34,700)	(292,088)	(12,200)
Options outstanding at ending of period (in shares)		582,845	526,985	765,411
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)		$ 16.49	$ 10.27	$ 8.95
Granted (in dollars per share)		21.49	20.73	16.76
Exercised (in dollars per share)		10.25	10.47	7.71
Forfeited / Canceled (in dollars per share)		14.39	6.71	11.00
Options outstanding at ending of period (in dollars per share)		$ 18.32	$ 16.49	$ 10.27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, weighted average remaining contractual term		7 years 6 months	7 years 8 months 12 days	7 years 3 months 18 days	7 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]
Options outstanding at beginning of period		$ 2,932,000	$ 4,521,000	$ 4,511,000
Options outstanding at ending of period		2,793,000	2,932,000	4,521,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested, number of shares						269,200	288,900
Nonvested options, weighted average grant date fair value						$ 20.96	$ 8.34
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to stock awards		$ 200,000	$ 400,000	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Common stock, shares outstanding (in shares)						18,000	31,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Granted (in dollars per share)		$ 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 (in dollars 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 (in shares)	(284,888)

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