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SIGNIFICANT ACCOUNTING POLICIES (Details)
3 Months Ended 6 Months Ended
Jun. 26, 2015
USD ($)
$ / shares
Jun. 27, 2014
USD ($)
Jun. 26, 2015
USD ($)
Segment
$ / shares
Jun. 27, 2014
USD ($)
Dec. 31, 2014
USD ($)
Fiscal Year [Abstract]          
Number of shipping days 63 days 63 days 123 days 124 days  
Consolidation Policy [Abstract]          
Percentage of voting interest (in hundredths)     50.00%    
Inventories [Abstract]          
Raw materials $ 9,109,000   $ 9,109,000   $ 6,457,000
Finished goods 15,043,000   15,043,000   14,714,000
Inventory reserves (659,000)   (659,000)   (618,000)
LIFO reserve (4,137,000)   (4,137,000)   (4,672,000)
Total inventories $ 19,356,000   $ 19,356,000   $ 15,881,000
Percentage of LIFO inventory (in hundredths) 73.00%   73.00%   78.00%
FIFO inventory amount $ 4,100,000   $ 4,100,000   $ 4,700,000
Accumulated Comprehensive Loss [Abstract]          
Foreign currency translation adjustments 800,000   800,000   700,000
Pension and other postretirement benefits adjustments 800,000   800,000   800,000
Change in Estimate [Line Items]          
Property and equipment, net 13,151,000   $ 13,151,000   $ 10,158,000
Segment Reporting [Abstract]          
Number of segments | Segment     1    
Minimum [Member]          
Assumptions for expected term, volatility and risk-free rate [Abstract]          
Expected term (years)     1 year 2 months 12 days 2 years 2 months 12 days  
Volatility (in hundredths)     149.80% 274.80%  
Risk-free interest rate (in hundredths)     0.40% 0.50%  
Maximum [Member]          
Assumptions for expected term, volatility and risk-free rate [Abstract]          
Expected term (years)     5 years 5 years  
Volatility (in hundredths)     323.00% 362.50%  
Risk-free interest rate (in hundredths)     1.70% 1.60%  
Leasehold Improvements [Member]          
Change in Estimate [Line Items]          
Property and equipment, net 1,500,000   $ 1,500,000    
Accelerated depreciation $ 188,000   $ 251,000    
Accelerated depreciation on a per share basis (in dollars per share) | $ / shares $ 0.02   $ 0.03    
Selling, General and Administrative Expenses [Member]          
Stock appreciation right income [Abstract]          
Stock appreciation right expense $ 43,000 $ (9,000) $ 63,000 $ 35,000