INVENTORIES (Details) - USD ($)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
INVENTORIES
Finished goods	$ 5,448,000	$ 8,391,000
Work in process	1,365,000	1,198,000
Raw materials and supplies	9,907,000	10,770,000
Inventories	16,720,000	20,359,000
Increase in inventories, if inventories valued on the LIFO basis were valued at current costs	7,176,000	6,677,000
Inventory valuation reserves	1,747,000	$ 518,000
Decrease in net loss due to inventory adjustment	$ (968,000)