EARNINGS PER SHARE (EPS) (Details) (USD $)	3 Months Ended	12 Months Ended
Jan. 02, 2015	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Jan. 02, 2015	Dec. 27, 2013	Dec. 28, 2012
Earnings per share
Net income (loss)	$ 2,047,000	$ 4,161,000	$ 1,893,000	$ 1,315,000	$ 701,000	$ 842,000	$ 688,000	$ 399,000	$ 9,416,000	$ 2,630,000	$ (17,300,000)
Weighted-average common shares outstanding-basic	7,618,000	7,507,000	7,405,000	7,397,000	7,375,000	7,359,000	7,353,000	7,335,000	7,488,000	7,355,000	7,310,000
Effect of dilutive stock options and restricted stock awards (in shares)									251,000	140,000
Weighted-average common shares outstanding-diluted	7,986,000	7,855,000	7,661,000	7,609,000	7,520,000	7,526,000	7,401,000	7,382,000	7,739,000	7,495,000	7,310,000
Earnings per share:
Basic (in dollars per share)	$ 0.27us-gaap_EarningsPerShareBasic	$ 0.55us-gaap_EarningsPerShareBasic	$ 0.26us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.11us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 1.26us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ (2.37)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.26us-gaap_EarningsPerShareDiluted	$ 0.53us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ 0.17us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 1.22us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ (2.37)us-gaap_EarningsPerShareDiluted
Stock options
Anti-dilutive securities excluded from the computation of earnings per share
Number of awards excluded from calculation of dilutive potential common shares (in shares)									251,000	459,000	654,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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