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Debt and Leases - Debt (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Capex loan
Dec. 31, 2011
Capex loan
Dec. 31, 2012
Mexican loan
Dec. 31, 2011
Mexican loan
May 31, 1998
Industrial Development Revenue Bond
Dec. 31, 2012
Industrial Development Revenue Bond
Dec. 31, 2011
Industrial Development Revenue Bond
Dec. 31, 2012
Revolving line of credit
Dec. 31, 2011
Revolving line of credit
Jun. 17, 2011
Revolving line of credit
Jun. 16, 2011
Revolving line of credit
Dec. 31, 2012
Mexican Expansion Revolving Loan
Dec. 31, 2011
Mexican Expansion Revolving Loan
Dec. 31, 2012
Loans payable
Capex loan
Jun. 17, 2011
Loans payable
Capex loan
Jun. 16, 2011
Loans payable
Capex loan
Dec. 31, 2012
Loans payable
Mexican loan
Dec. 31, 2009
Loans payable
Mexican loan
Jun. 17, 2011
Loans payable
Mexican loan
Jun. 16, 2011
Loans payable
Mexican loan
Jun. 17, 2011
Loans payable
Revolving line of credit
Jun. 16, 2011
Loans payable
Revolving line of credit
Mar. 19, 2013
Loans payable
SMC molding and compunding capacity expansion
Subsequent event
Jun. 17, 2011
Loans payable
Mexican Expansion Revolving Loan
Dec. 31, 2012
Line of credit
Dec. 31, 2012
Line of credit
Capex loan
Dec. 31, 2012
Line of credit
Mexican loan
Dec. 31, 2012
Line of credit
Industrial Development Revenue Bond
Dec. 31, 2012
Line of credit
Revolving line of credit
Mar. 19, 2013
Line of credit
Revolving line of credit
Subsequent event
Dec. 31, 2012
Line of credit
Letter of credit
Debt:                                                                  
Debt $ 9,477,000 $ 13,581,000 $ 5,857,000 $ 7,571,000 $ 3,200,000 $ 4,800,000   $ 420,000 $ 1,210,000 $ 0 $ 0     $ 0 $ 0         $ 6,400,000                          
Current portion of long-term debt (3,734,000) (4,104,000)                                                              
Long-term debt 5,743,000 9,477,000                                                              
Stated interest rate     1.96% 2.02% 1.94% 1.94%   0.30% 0.37%                                                
Repayment term     7 years   5 years                                                        
Debt instrument, face amount     12,000,000   8,000,000   7,500,000                 12,000,000                   10,000,000   12,000,000 8,000,000       3,332,493
Percent of subsidiary stock not security for financing 65.00%                                                   65.00%            
Line of credit facility, maximum borrowing capacity                                                     8,000,000       8,000,000 18,000,000  
Description of variable rate basis                           daily LIBOR   30 day LIBOR     daily LIBOR daily LIBOR           LIBOR daily LIBOR            
Basis spread on variable rate                                 1.75% 2.75%     1.75% 2.75% 1.75% 2.75%   1.75%              
Planned capital improvements excluded from fixed charge                                                 18,000,000 14,500,000              
Interest rate at period end                               0.21%     0.19%                            
Letter of credit fee percentage                       1.75% 3.00%                                        
Stated interest rate percentage, maximum             10.00%                                                    
Debt instrument, collateral amount                                                           433,000      
Mexican Expansion Revolving Loan, unused borrowing capacity, mount                           10,000,000                                      
Annual maturities of long-term debt:                                                                  
2013 3,734,000                                                                
2014 3,314,000                                                                
2015 1,714,000                                                                
2016 715,000                                                                
2017 $ 0