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Debt (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Debt Instrument [Line Items]      
Debt $ 7,238,000   $ 9,477,000
Current portion of long-term debt (3,524,000)   (3,734,000)
Long-term debt 3,714,000   5,743,000
Percent of subsidiary stock not security for financing 65.00%    
Letter of credit - original face amount 3,332,493    
Interest expense for settlements related to swaps 31,000 50,000  
Capex Loan [Member]
      
Debt Instrument [Line Items]      
Debt 5,428,000   5,857,000
Long-term Debt, Maturities, Repayment Term 7 years    
Mexican Loan [Member]
      
Debt Instrument [Line Items]      
Debt 1,600,000   3,200,000
Long-term Debt, Maturities, Repayment Term 5 years    
Industrial Development Revenue Bond [Member]
      
Debt Instrument [Line Items]      
Debt 210,000   420,000
Line of Credit [Member]
      
Debt Instrument [Line Items]      
Debt 0   0
Mexican Expansion Revolving Loan [Member]
      
Debt Instrument [Line Items]      
Debt 0   0
Revolving Line of Credit [Member] | Line of Credit [Member]
      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 18,000,000   8,000,000
Debt Instrument, Planned Capital Improvements Excluded From Fixed Charge 18,000,000    
Capex Loan [Member]
      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount 12,000,000    
Debt Instrument, Interest Rate, Stated Percentage 1.95%   1.96%
Mexican Loan [Member]
      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount 8,000,000    
Debt Instrument, Interest Rate, Stated Percentage 1.94%   1.94%
Industrial Development Revenue Bond [Member]
      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 0.30%   0.30%
Line of Credit [Member]
      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 8,000,000    
Debt Instrument, Description of Variable Rate Basis daily LIBOR    
Debt Instrument, Interest Rate, Stated Percentage       
Debt Instrument, Basis Spread on Variable Rate 1.75%    
Mexican Expansion Revolving Loan [Member]
      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.75%    
Industrial Development Revenue Bond Swap Agreement [Member]
      
Debt Instrument [Line Items]      
Derivative, Fixed Interest Rate 4.89%    
Derivative, Description of Variable Rate Basis 76% of the 30-day commercial paper rate    
Derivative, Variable Interest Rate 0.09%    
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, is being 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.    
Derivative Liability, Fair Value, Gross Liability 3,000   8,000
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 5,000    
Notional amount of swap 210,000   420,000
Capex Loan Swap Agreement [Member]
      
Debt Instrument [Line Items]      
Derivative, Fixed Interest Rate 2.295%    
Derivative, Description of Variable Rate Basis LIBOR    
Derivative, Variable Interest Rate 0.20%    
Description of Reclassification of Cash Flow Hedge Gain (Loss) 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 $2,000 per month, or $1,000 net of tax, over the remaining term of the interest rate swap agreement.    
Derivative Liability, Fair Value, Gross Liability 175,000   205,000
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 30,000    
Notional amount of swap $ 5,428,000   $ 5,857,000