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Debt and Leases - Debt (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 08, 2010 | Dec. 31, 2008 | May. 31, 1998
Debt: |  |  |  |  |  |
Long-term Debt | $ 13,464,000 | $ 5,196,000 |  |  |  |
Current portion of long-term debt | (3,714,000) | (4,482,000) |  |  |  |
Long-term debt | 9,750,000 | 714,000 |  |  |  |
Planned capital improvements excluded from fixed charge | 18,000,000 |  |  |  |  |
Loans payable | Capex loan |  |  |  |  |  |
Debt: |  |  |  |  |  |
Long-term Debt | $ 714,000 | $ 2,428,000 |  |  |  |
Stated interest rate | 2.04% | 1.76% |  |  |  |
Repayment term | 7 years |  |  |  |  |
Debt instrument, face amount | $ 12,000,000 |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | 30 day LIBOR |  |  |  |  |
Basis spread on variable rate | 1.60% | 1.75% |  |  |  |
Loans payable | Term Loan [Member] |  |  |  |  |  |
Debt: |  |  |  |  |  |
Long-term Debt | $ 12,750,000 | $ 0 |  |  |  |
Repayments of Short-term Debt | $ 500,000 |  |  |  |  |
Stated interest rate | 2.24% |  |  |  |  |
Repayment term | 5 years |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | 30 day LIBOR |  |  |  |  |
Basis spread on variable rate | 1.80% |  |  |  |  |
Proceeds from (Repayments of) Debt | $ 15,500,000 |  |  |  |  |
Loans payable | Mexican Loan [Member] |  |  |  |  |  |
Debt: |  |  |  |  |  |
Stated interest rate |  | 1.73% |  |  |  |
Repayment term |  | 5 years |  |  |  |
Debt instrument, face amount |  |  |  | $ 8,000,000 |  |
Debt Instrument, Description of Variable Rate Basis |  | LIBOR |  |  |  |
Basis spread on variable rate |  | 1.60% | 1.75% |  |  |
Loans payable | Industrial Development Revenue Bond |  |  |  |  |  |
Debt: |  |  |  |  |  |
Stated interest rate |  | 0.30% |  |  |  |
Debt instrument, face amount | $ 3,332,493 |  |  |  |  | $ 7,500,000
Loans payable | Mexican Expansion Revolving Loan |  |  |  |  |  |
Debt: |  |  |  |  |  |
Basis spread on variable rate | 1.60% |  |  |  |  |
Line of credit |  |  |  |  |  |
Debt: |  |  |  |  |  |
Percent of subsidiary stock not security for financing | 65.00% |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 18,000,000 |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | daily LIBOR |  |  |  |  |
Line of credit | Mexican Loan [Member] |  |  |  |  |  |
Debt: |  |  |  |  |  |
Debt instrument, face amount | $ 8,000,000 |  |  |  |  |
Line of credit | Revolving line of credit |  |  |  |  |  |
Debt: |  |  |  |  |  |
Long-term Debt | 0 | $ 2,768,000 |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 18,000,000 |  |  |  | $ 8,000,000 |
Basis spread on variable rate | 1.60% | 1.75% |  |  |  |
Line of credit | Mexican Expansion Revolving Loan |  |  |  |  |  |
Debt: |  |  |  |  |  |
Mexican Expansion Revolving Loan, unused borrowing capacity, mount | $ 10,000,000 |  |  |  |  |

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