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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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