Quarterly report pursuant to Section 13 or 15(d)

LIABILITIES AND LONG-TERM DEBT (Details)

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LIABILITIES AND LONG-TERM DEBT (Details) - USD ($)
 6 Months Ended
Oct. 01, 2014
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Short-term amount outstanding   $ 7,263,000 $ 7,000,000
Long-term amount outstanding   69,687,000 73,450,000
Revolving Loan [Member]      
Debt Instrument [Line Items]      
Commitment fee (in hundredths) 0.37%    
Revolving Note One [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   40,000,000  
Borrowed funds under the agreement   7,200,000 7,200,000
Available remaining borrowing capacity   $ 32,800,000  
Term loan [Member]      
Debt Instrument [Line Items]      
Maturity date   Sep. 30, 2019  
Short-term amount outstanding   $ 7,000,000 7,000,000
Long-term amount outstanding   $ 57,800,000 $ 61,300,000
Interest rate on loan (in hundredths)   2.44% 2.67%
Total long-term debt $ 70,000,000    
Amortization period for principal on acquisition term loan   10 years  
Quarterly installment amount of acquisition term loan $ 1,750,000    
Term Note One [Member] | Revolving Note One [Member]      
Debt Instrument [Line Items]      
Short-term amount outstanding   $ 300,000 $ 0
Long-term amount outstanding   4,700,000 $ 5,000,000
Available remaining borrowing capacity   20,000,000  
Amount of multiple advance loan can be borrowed   $ 25,000,000