Quarterly report pursuant to sections 13 or 15(d)

LIABILITIES AND LONG-TERM DEBT (Details)

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LIABILITIES AND LONG-TERM DEBT (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Nov. 30, 2008
Sep. 30, 2007
Debt Instrument [Line Items]        
Short-term amount outstanding $ 1,400,000 $ 1,400,000    
Long-term amount outstanding 9,489,000 11,839,000    
Supplier term of agreement 7 years      
Supplier term of agreement, elapsed 6 years 9 months      
Domestic Bank [Member] | Revolving Loan [Member]
        
Debt Instrument [Line Items]        
Long-term amount outstanding 4,500,000 6,500,000    
Original maximum borrowing capacity 12,000,000      
Maximum borrowing capacity 18,000,000      
Expiration date Jun. 30, 2015      
Credit agreement sub limit available to support hedging program 3,000,000      
Interest rate (in hundredths) 3.25% 3.25%    
Quarterly commitment fee on the unused portion of loan (in hundredths) 0.25%      
Available remaining borrowing capacity 13,500,000      
Term loan [Member]
        
Debt Instrument [Line Items]        
Initial face amount of loan       10,000,000
Face amount     14,000,000  
Maturity date Oct. 31, 2018      
Short-term amount outstanding 1,400,000 1,400,000    
Long-term amount outstanding 5,000,000 5,400,000    
Interest rate on loan (in hundredths) 3.25% 3.25%    
Principal payments 350,000      
Derivative amount of hedged item       $ 10,000,000