EARNINGS PER SHARE (EPS) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Earnings per share
Net income	$ 2,886,000	$ 2,462,000	$ 8,839,000	$ 6,730,000
Weighted-average common shares outstanding (in shares)	8,730,000	8,308,000	8,580,000	8,181,000
Effect of dilutive stock options and restricted stock awards (in shares)	518,000	412,000	558,000	335,000
Weighted-average common shares outstanding-diluted (in shares)	9,248,000	8,720,000	9,138,000	8,516,000
Earnings per share:
Basic (in dollars per share)	$ 0.33	$ 0.30	$ 1.03	$ 0.82
Diluted (in dollars per share)	$ 0.31	$ 0.28	$ 0.97	$ 0.79
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)	137,000	280,000	89,000	330,000