Income Taxes: (Details 2) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Income Taxes:
Federal income taxes receivable	$ 600,000	$ 400,000
State income tax liability	100,000
State income taxes receivables		200,000
Reconciliation between the amount determined by applying the statutory federal income tax rate to the income tax provision
Provision at statutory rate	3,971,685	1,469,998
State tax provision, net	364,722	166,638
Research Credits	(152,216)	(152,971)
Domestic Production benefits	(333,836)	(137,280)
Nondeductible expenses and other	382,556	161,453
Income tax provision	$ 4,232,911	$ 1,507,838
Effective income tax rate reconciliation
Provision at statutory rate (as a percent)	34.00%	34.00%
State tax provision, net (as a percent)	3.10%	3.90%
Research Credits (as a percent)	(1.30%)	(3.50%)
Domestic Production Benefits (as a percent)	(2.90%)	(3.20%)
Nondeductible expenses and other (as a percent)	3.30%	3.70%
Income tax provision (as a percent)	36.20%	34.90%