STOCKHOLDERS' EQUITY. (Details 2) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Outstanding
Number Outstanding (in shares)	959,808
Weighted-Average Remaining Contractual Life	2 years 6 months 22 days
Weighted-Average Exercise Price (in dollars per share)	$ 3.93
Exercisable
Number Exercisable (in shares)	863,741
Weighted-Average Exercise Price (in dollars per share)	$ 4.13
Intrinsic value of outstanding exercisable options	$ 635,280	$ 269,841
Intrinsic value of options outstanding	$ 739,586	$ 369,906
$6.52 - 7.17
Exercise price
Range of Exercise prices, low end of range (in dollars per share)	$ 6.52
Range of Exercise prices, high end of range (in dollars per share)	$ 7.17
Outstanding
Number Outstanding (in shares)	270,300
Weighted-Average Remaining Contractual Life	4 months 2 days
Weighted-Average Exercise Price (in dollars per share)	$ 6.60
Exercisable
Number Exercisable (in shares)	270,300
Weighted-Average Exercise Price (in dollars per share)	$ 6.60
$5.78 - 6.36
Exercise price
Range of Exercise prices, low end of range (in dollars per share)	$ 5.78
Range of Exercise prices, high end of range (in dollars per share)	$ 6.36
Outstanding
Number Outstanding (in shares)	85,240
Weighted-Average Remaining Contractual Life	1 year 3 months 29 days
Weighted-Average Exercise Price (in dollars per share)	$ 6.00
Exercisable
Number Exercisable (in shares)	85,240
Weighted-Average Exercise Price (in dollars per share)	$ 6.00
$5.73
Exercise price
Exercise price (in dollars per share)	$ 5.73
Outstanding
Number Outstanding (in shares)	6,487
Weighted-Average Remaining Contractual Life	2 years 18 days
Weighted-Average Exercise Price (in dollars per share)	$ 5.73
Exercisable
Number Exercisable (in shares)	6,487
Weighted-Average Exercise Price (in dollars per share)	$ 5.73
$4.72 - 5.34
Exercise price
Range of Exercise prices, low end of range (in dollars per share)	$ 4.72
Range of Exercise prices, high end of range (in dollars per share)	$ 5.34
Outstanding
Number Outstanding (in shares)	96,795
Weighted-Average Remaining Contractual Life	2 years 4 months 6 days
Weighted-Average Exercise Price (in dollars per share)	$ 4.99
Exercisable
Number Exercisable (in shares)	96,795
Weighted-Average Exercise Price (in dollars per share)	$ 4.99
$1.41 - 1.42
Exercise price
Range of Exercise prices, low end of range (in dollars per share)	$ 1.41
Range of Exercise prices, high end of range (in dollars per share)	$ 1.42
Outstanding
Number Outstanding (in shares)	83,118
Weighted-Average Remaining Contractual Life	2 years 9 months 29 days
Weighted-Average Exercise Price (in dollars per share)	$ 1.42
Exercisable
Number Exercisable (in shares)	83,118
Weighted-Average Exercise Price (in dollars per share)	$ 1.42
$1.55 - 1.71
Exercise price
Range of Exercise prices, low end of range (in dollars per share)	$ 1.55
Range of Exercise prices, high end of range (in dollars per share)	$ 1.71
Outstanding
Number Outstanding (in shares)	140,334
Weighted-Average Remaining Contractual Life	3 years 5 months 26 days
Weighted-Average Exercise Price (in dollars per share)	$ 1.57
Exercisable
Number Exercisable (in shares)	140,334
Weighted-Average Exercise Price (in dollars per share)	$ 1.57
$2.67
Exercise price
Exercise price (in dollars per share)	$ 2.67
Outstanding
Number Outstanding (in shares)	10,000
Weighted-Average Remaining Contractual Life	4 years 2 months 5 days
Weighted-Average Exercise Price (in dollars per share)	$ 2.67
Exercisable
Number Exercisable (in shares)	6,667
Weighted-Average Exercise Price (in dollars per share)	$ 2.67
$2.23 - 2.45
Exercise price
Range of Exercise prices, low end of range (in dollars per share)	$ 2.23
Range of Exercise prices, high end of range (in dollars per share)	$ 2.45
Outstanding
Number Outstanding (in shares)	267,534
Weighted-Average Remaining Contractual Life	4 years 7 months 28 days
Weighted-Average Exercise Price (in dollars per share)	$ 2.21
Exercisable
Number Exercisable (in shares)	174,800
Weighted-Average Exercise Price (in dollars per share)	$ 2.26