Property and Equipment: (Details) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Property and equipment
Property and equipment, gross	$ 62,574,342	$ 57,658,579
Less accumulated depreciation and amortization	(28,523,536)	(24,476,248)
Property and equipment, net	34,050,806	33,182,331
Total cost of equipment and furniture and office equipment held under capital lease obligations	2,600,000	3,700,000
Depreciation expense, including amortization of property under capital leases	4,677,637	4,601,582
Minimum
Property and equipment
Useful Lives	2 years
Maximum
Property and equipment
Useful Lives	30 years
Buildings and improvements
Property and equipment
Property and equipment, gross	13,414,686	13,372,831
Buildings and improvements | Minimum
Property and equipment
Useful Lives	20 years
Buildings and improvements | Maximum
Property and equipment
Useful Lives	30 years
Equipment
Property and equipment
Property and equipment, gross	43,800,475	39,113,158
Equipment | Minimum
Property and equipment
Useful Lives	7 years
Equipment | Maximum
Property and equipment
Useful Lives	15 years
Land
Property and equipment
Property and equipment, gross	346,506	346,506
Vehicles
Property and equipment
Useful Lives	5 years
Property and equipment, gross	50,315	51,128
Furniture and office equipment
Property and equipment
Property and equipment, gross	$ 4,962,360	$ 4,774,956
Furniture and office equipment | Minimum
Property and equipment
Useful Lives	2 years
Furniture and office equipment | Maximum
Property and equipment
Useful Lives	5 years