Commitments and Contingencies: (Details) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Employee Benefit Plan
Service period for vesting of employer contribution	5 years
Company contributions	$ 271,800	$ 280,000
Operating Leases
Rent expense under operating leases	866,300	840,600
Minimum rental commitments
2013	567,300
2014	515,800
2015	516,600
2016	525,000
2017	533,400
Thereafter	906,600
Total	3,564,700
Total deferred rent	1,100,000	1,200,000
Deferred rent included in other liabilities	$ 900,000	$ 1,100,000