SHARE-BASED COMPENSATION- Stock Warrants (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Document Period End Date	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Exercised	13,800	87,655	0
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to stock awards	$ 0	$ 0	$ 6,523
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average fair value of warrants	$ 2.48	$ 2.48	$ 2.43
Weighted-average risk-free interest rate	0.60%	0.60%	0.90%
Weighted-average dividend yield	100.00%	100.00%	100.00%
Weighted-average volatility factor	43.20%	43.20%	49.00%
Weighted-average expected life	3 years	3 years	5 years 4 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Warrants outstanding at beginning of period (in shares)	123,984	133,833	326,822
Granted	0	32,250	77,970
Exercised	0	(42,099)	(102,510)
Expired	0	0	(168,449)
Warrants outstanding at ending of period (in shares)	123,984	123,984	133,833	326,822
Warrants exercisable (in shares)	123,984	91,734
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price [Abstract] [Abstract]
Warrants outstanding at beginning of period (in dollars per share)	$ 11.51	$ 10.21	$ 8.24
Granted	0.00	16.80	11.85
Exercised	0.00	11.42	4.68
Expired	0.00	0.00	10.85
Warrants outstanding at ending of period (in dollars per share)	11.51	11.51	$ 10.21	$ 8.24
Warrants exercisable (in dollars per share)	$ 11.51	$ 9.65
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Additional Disclosures [Abstract]
Warrants outstanding, weighted remaining contractual life	2 years 2 months 9 days	2 years 9 months 22 days	3 years 6 months 15 days	2 years 11 months 9 days
Warrants exercisable, weighted remaining contractual life	2 years 2 months 9 days	2 years 2 months 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Intrinsic Value [Abstract]
Warrants outstanding at beginning of period	$ 532,000	$ 634,000	$ 1,226,000
Warrants outstanding at ending of period	577,000	532,000	$ 634,000	$ 1,226,000
Warrants exercisable, total intrinsic value	$ 577,000	$ 532,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested, number of warrants	0	32,250
Nonvested warrants, weighted average grant date fair value	$ 0.00	$ 2.48
Conversion of stock, shares issued	0	17,910	102,510
Exercised	0	42,099	102,510
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to stock awards	$ 400,000	$ 300,000	$ 300,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average fair value of warrants	$ 3.94	$ 4.05	$ 1.83
Weighted-average risk-free interest rate	1.80%	1.10%	1.50%
Weighted-average dividend yield	100.00%	100.00%	100.00%
Weighted-average volatility factor	43.20%	43.20%	43.20%
Weighted-average expected life	6 years	6 years	6 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Conversion of stock, shares issued	5,221	55,974	0
Exercised	28,800	103,055	50,800