STOCKHOLDERS' EQUITY. (Details 2) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Outstanding
Number Outstanding (in shares)	535,431
Weighted-Average Remaining Contractual Life	2 years 5 months 16 days
Weighted-Average Exercise Price (in dollars per share)	$ 2.79
Exercisable
Number Exercisable (in shares)	535,431
Weighted-Average Exercise Price (in dollars per share)	$ 2.79
Intrinsic value of outstanding exercisable options	$ 1,510,029	$ 635,280
Intrinsic value of options outstanding	$ 1,510,029	$ 739,586
$5.51 - 6.06
Exercise price
Range of Exercise prices, low end of range (in dollars per share)	$ 5.51
Range of Exercise prices, high end of range (in dollars per share)	$ 6.06
Outstanding
Number Outstanding (in shares)	64,076
Weighted-Average Remaining Contractual Life	3 months 29 days
Weighted-Average Exercise Price (in dollars per share)	$ 5.79
Exercisable
Number Exercisable (in shares)	64,076
Weighted-Average Exercise Price (in dollars per share)	$ 5.79
$5.46
Exercise price
Exercise price (in dollars per share)	$ 5.46
Outstanding
Number Outstanding (in shares)	6,811
Weighted-Average Remaining Contractual Life	1 year 18 days
Weighted-Average Exercise Price (in dollars per share)	$ 5.46
Exercisable
Number Exercisable (in shares)	6,811
Weighted-Average Exercise Price (in dollars per share)	$ 5.46
$4.62 - 5.09
Exercise price
Range of Exercise prices, low end of range (in dollars per share)	$ 4.62
Range of Exercise prices, high end of range (in dollars per share)	$ 5.09
Outstanding
Number Outstanding (in shares)	79,596
Weighted-Average Remaining Contractual Life	1 year 4 months 6 days
Weighted-Average Exercise Price (in dollars per share)	$ 4.83
Exercisable
Number Exercisable (in shares)	79,596
Weighted-Average Exercise Price (in dollars per share)	$ 4.83
$1.35
Exercise price
Exercise price (in dollars per share)	$ 1.35
Outstanding
Number Outstanding (in shares)	63,773
Weighted-Average Remaining Contractual Life	1 year 9 months 29 days
Weighted-Average Exercise Price (in dollars per share)	$ 1.35
Exercisable
Number Exercisable (in shares)	63,773
Weighted-Average Exercise Price (in dollars per share)	$ 1.35
$1.48 - 1.63
Exercise price
Range of Exercise prices, low end of range (in dollars per share)	$ 1.48
Range of Exercise prices, high end of range (in dollars per share)	$ 1.63
Outstanding
Number Outstanding (in shares)	112,700
Weighted-Average Remaining Contractual Life	2 years 5 months 26 days
Weighted-Average Exercise Price (in dollars per share)	$ 1.50
Exercisable
Number Exercisable (in shares)	112,700
Weighted-Average Exercise Price (in dollars per share)	$ 1.50
$2.12 - 2.33
Exercise price
Range of Exercise prices, low end of range (in dollars per share)	$ 2.12
Range of Exercise prices, high end of range (in dollars per share)	$ 2.33
Outstanding
Number Outstanding (in shares)	208,475
Weighted-Average Remaining Contractual Life	3 years 9 months 4 days
Weighted-Average Exercise Price (in dollars per share)	$ 2.15
Exercisable
Number Exercisable (in shares)	208,475
Weighted-Average Exercise Price (in dollars per share)	$ 2.15