PROPERTY, PLANT AND EQUIPMENT. (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 95,541,209	$ 92,795,659
Less, Accumulated depreciation and amortization	49,153,370	49,857,671
Property, plant and equipment, net	46,387,839	42,937,988
Land
Property, Plant and Equipment
Property, plant and equipment, at cost	4,243,448	4,144,158
Land improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	6,852,111	6,442,647
Buildings
Property, Plant and Equipment
Property, plant and equipment, at cost	42,606,220	40,084,004
Machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 41,839,430	$ 42,124,850