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Debt (Details) (USD $)
 0 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Mar. 27, 2014
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Industrial Development Revenue Bond Swap Agreement [Member]
Jun. 30, 2014
Industrial Development Revenue Bond Swap Agreement [Member]
Accumulated Other-than-Temporary Impairment [Member]
Dec. 31, 2009
Industrial Development Revenue Bond Swap Agreement [Member]
Accumulated Other-than-Temporary Impairment [Member]
Jun. 30, 2014
Industrial Development Revenue Bond Swap Agreement [Member]
Commercial Paper Rate, 30 Days [Member]
Jun. 30, 2014
Capex Loan Swap Agreement [Member]
Dec. 31, 2013
Capex Loan Swap Agreement [Member]
Jun. 30, 2014
Capex Loan Swap Agreement [Member]
Accumulated Other-than-Temporary Impairment [Member]
Mar. 31, 2009
Capex Loan Swap Agreement [Member]
Accumulated Other-than-Temporary Impairment [Member]
Jun. 30, 2014
Revolving Credit Facility [Member]
Mar. 27, 2014
Revolving Credit Facility [Member]
Mar. 26, 2014
Revolving Credit Facility [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
Jun. 30, 2014
Capex Loan [Member]
Dec. 31, 2013
Capex Loan [Member]
Jun. 30, 2014
Mexican Loan [Member]
Dec. 31, 2013
Mexican Loan [Member]
Mar. 27, 2014
Mexican Expansion Revolving Loan [Member]
Revolving Credit Facility [Member]
Debt, Long-term and Short-term, Combined Amount [Abstract]                                          
Debt   $ 10,898,000   $ 5,743,000                         $ 3,286,000 $ 4,143,000 $ 0 $ 1,600,000  
Revolving Line of Credit   7,612,000   0                       0          
Less current portion   (9,326,000)   (3,314,000)                                  
Long-term debt   1,572,000   2,429,000                                  
Debt Instrument, Interest Rate, Stated Percentage                                 1.75% 1.77%   1.73%  
Debt - face amount                                 12,000,000   8,000,000    
Maximum borrowing capacity                           18,000,000 8,000,000            
Letter of credit - original face amount   3,332,493                                      
Percent of subsidiary stock not security for financing   65.00%                                      
Capital Improvements Excluded From Fixed Charge 18,000,000                                        
Line of Credit Facility, Remaining Borrowing Capacity                                         10,000,000
Debt Instrument, Description of Variable Rate Basis                         daily LIBOR                
Debt Instrument, Basis Spread on Variable Rate                         1.60%                
Derivative, Fixed Interest Rate         4.89%       2.295%                        
Variable Rate Receivable               76.00%                          
Derivative, Description of Variable Rate Basis         76% of the 30-day commercial paper rate       LIBOR                        
Pre-Tax Loss             200,000         146,000                  
Amortization of Pre-Tax Loss to Interest Expense, Before Tax, Monthly           5,000         2,000                    
Amortization of Pre-Tax Loss to Interest Expense, Net of Tax, Monthly           3,000         1,000                    
Description of Reclassification of Cash Flow Hedge Gain (Loss)         The pre-tax loss previously recognized in Accumulated Other Comprehensive Income, totaling $200,000 as of December 31, 2009, was amortized as an increase to interest expense of $5,000 per month, or $3,000 net of tax, over the remaining term of the interest rate swap agreement.       The pre-tax loss previously recognized in Accumulated Other Comprehensive Income, totaling $146,000 as of March 31, 2009, is being amortized as an increase to interest expense of approximately $2,000 per month, or $1,000 net of tax, over the remaining term of the interest rate swap agreement.                        
Derivative, Variable Interest Rate                 0.15%                        
Interest rate swaps                 68,000 103,000                      
Interest income (loss) for mark-to-market adjustment of swap fair value                 35,000                        
Notional amount                 3,286,000 4,143,000                      
Interest expense for settlements related to swaps   $ 41,000 $ 62,000