PROPERTY, PLANT AND EQUIPMENT. (Details) - USD ($)	Dec. 31, 2016	Dec. 26, 2015
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 94,798,970	$ 93,302,248
Less, accumulated depreciation and amortization	49,051,037	47,115,884
Property, plant and equipment, net	45,747,933	46,186,364
Properties in Indiana and Rhode Island
Property, Plant and Equipment
Property, plant and equipment, net	7,100,000
Land
Property, Plant and Equipment
Property, plant and equipment, at cost	3,888,316	3,746,093
Land Improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	7,246,508	7,242,766
Building
Property, Plant and Equipment
Property, plant and equipment, at cost	45,691,462	45,097,638
Machinery And Equipment
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 37,972,684	$ 37,215,751