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Debt (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Debt Instrument [Line Items]          
Debt $ 12,972,000 $ 13,581,000 $ 12,972,000 $ 13,581,000  
Current portion of long-term debt (6,372,000) (4,104,000) (6,372,000) (4,104,000)  
Long-term debt 6,600,000 9,477,000 6,600,000 9,477,000 9,477,000
Letter of credit - original face amount 3,332,493   3,332,493    
Percent of subsidiary stock not security for financing 65.00%   65.00%    
Expected investment in facility expansion 14,500,000   14,500,000    
Derivatives not designated as hedging instruments, interest rate swap liabilities 276,000   276,000   331,000
Interest expense for settlements related to swaps 43,000 61,000 93,000 127,000  
Capex Loan [Member]
          
Debt Instrument [Line Items]          
Debt 6,714,000 7,571,000 6,714,000 7,571,000  
Long-term Debt, Maturities, Repayment Term     7 years    
Mexican Loan [Member]
          
Debt Instrument [Line Items]          
Debt 3,200,000 4,800,000 3,200,000 4,800,000  
Long-term Debt, Maturities, Repayment Term     5 years    
Industrial Development Revenue Bond [Member]
          
Debt Instrument [Line Items]          
Debt 825,000 1,210,000 825,000 1,210,000  
Line of Credit [Member]
          
Debt Instrument [Line Items]          
Debt 2,233,000 0 2,233,000 0  
Mexican Expansion Revolving Loan [Member]
          
Debt Instrument [Line Items]          
Debt 0 0 0 0  
Capex Loan [Member]
          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount 12,000,000   12,000,000    
Debt Instrument, Interest Rate, Stated Percentage 1.99%   1.99%   2.02%
Mexican Loan [Member]
          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount 8,000,000   8,000,000    
Debt Instrument, Interest Rate, Stated Percentage 1.94%   1.94%   1.94%
Industrial Development Revenue Bond [Member]
          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 0.36%   0.36%   0.37%
Line of Credit [Member]
          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 8,000,000   8,000,000    
Debt Instrument, Description of Variable Rate Basis     daily LIBOR    
Debt Instrument, Interest Rate, Stated Percentage 1.94%   1.94%    
Debt Instrument, Basis Spread on Variable Rate 1.75%   1.75%    
Mexican Expansion Revolving Loan [Member]
          
Debt Instrument [Line Items]          
Debt Instrument, Description of Variable Rate Basis     daily LIBOR    
Debt Instrument, Basis Spread on Variable Rate 1.75%   1.75%    
Mexican Expansion Revolving Loan, unused borrowing capacity, Amount 10,000,000   10,000,000    
Term Loan [Member]
          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount 2,678,563   2,678,563    
Industrial Development Revenue Bond Swap Agreement [Member]
          
Debt Instrument [Line Items]          
Derivative, Fixed Interest Rate 4.89%   4.89%    
Derivative, Description of Variable Rate Basis     76% of the 30-day commercial paper rate    
Derivative, Variable Interest Rate 0.10%   0.10%    
Description of Reclassification of Cash Flow Hedge Gain (Loss)     The pre-tax loss previously recognized in Accumulated Other Comprehensive Income (Loss), 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.    
Derivatives not designated as hedging instruments, interest rate swap liabilities 25,000   25,000   52,000
Interest income (loss) for mark-to-market adjustment of swap fair value     27,000    
Notional amount of swap 825,000   825,000   1,210,000
Capex Loan Swap Agreement [Member]
          
Debt Instrument [Line Items]          
Derivative, Fixed Interest Rate 2.295%   2.295%    
Derivative, Description of Variable Rate Basis     LIBOR    
Derivative, Variable Interest Rate 0.24%   0.24%    
Description of Reclassification of Cash Flow Hedge Gain (Loss)     The pre-tax loss previously recognized in Accumulated Other Comprehensive Income (Loss), 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.    
Derivatives not designated as hedging instruments, interest rate swap liabilities 251,000   251,000   279,000
Interest income (loss) for mark-to-market adjustment of swap fair value     28,000    
Notional amount of swap $ 6,714,000   $ 6,714,000   $ 7,571,000