Commitments and Contingencies: (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Employee Benefit Plan
Service period for vesting of employer contribution	5 years
Company contributions	$ 281,900	$ 271,800	$ 280,000
Operating Leases
Rent expense under operating leases	883,800	866,300	840,600
Minimum rental commitments
2014	603,200
2015	677,500
2016	691,200
2017	705,000
2018	718,800
Thereafter	446,100
Total	3,841,800
Total deferred rent	1,100,000	1,100,000
Deferred rent included in other liabilities	$ 1,000,000	$ 900,000