STOCK-BASED COMPENSATION. (Details) (USD $)	9 Months Ended
	Sep. 27, 2014
Restricted Stock [Member]
Number of Shares
Unvested at the beginning of the period (in shares)	110,431
Granted (in shares)	60,896
Vested (in shares)	(48,287)
Unvested at the end of the period (in shares)	123,040
Weighted - Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share)	$ 3.99
Granted (in dollars per share)	$ 6.87
Vested (in dollars per share)	$ 4.69
Unvested at the end of the period (in dollars per share)	$ 5.14
Total fair value of shares vested and recognized as stock-based compensation expense during the year	$ 226,336
Stock-based compensation, additional disclosure
Granted (in shares)	60,896
Employee And Nonemployee Stock Option [Member]
Options
Outstanding at the beginning of the period (in shares)	535,431
Exercised (in shares)	(174,639)
Outstanding at the end of the period (in shares)	360,792
Weighted - Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 2.79
Exercised (in dollars per share)	$ 3.24
Outstanding at the end of the period (in dollars per share)	$ 2.58
Stock-based compensation, additional disclosure
Intrinsic value of outstanding exercisable options	1,931,538
Weighted-average remaining contractual life of options exercisable	1 year 10 months 24 days
Total unrecognized compensation expense	680,962
Recognition of unrecognized compensation expense over weighted average contractual life	1 year 10 months 24 days
Director [Member]
Number of Shares
Granted (in shares)	19,838
Stock-based compensation, additional disclosure
Stock award paid as compensation to outside directors	27,500
Granted (in shares)	19,838
Stock-based compensation expense	$ 130,625