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Long-Term Debt (Details) (USD $) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jan. 31, 2012 | Sep. 30, 2013 acre | Dec. 31, 2012
Long-Term Debt |  |  |  |
Long-term debt |  |  | $ 50,507,000 | $ 49,268,000
Less current portion |  |  | 50,507,000 | 4,068,000
Long-term debt |  |  |  | 45,200,000
Minimum |  |  |  |
Long-Term Debt |  |  |  |
Required liquidity under financial covenants |  |  | 4,000,000 |
Maximum |  |  |  |
Long-Term Debt |  |  |  |
Required total liabilities under financial covenants |  |  | 175,000,000 |
Wells Fargo revolving loans |  |  |  |
Long-Term Debt |  |  |  |
Long-term debt |  |  | 28,200,000 | 25,200,000
Interest rate (as a percent) |  |  | 4.00% | 4.05%
Maximum borrowing capacity |  |  | 32,700,000 |
Variable rate basis |  |  | LIBOR |
Interest rate margin (as a percent) |  |  | 3.80% |
Area of the company's real estate pledged as collateral (in acres) |  |  | 880 |
Commitment fees on the unused portion of the revolving facility |  |  | 0 |
Available borrowing capacity |  |  | 4,500,000 |
Wells Fargo revolving loans | Minimum |  |  |  |
Long-Term Debt |  |  |  |
Required liquidity under financial covenants |  |  | 3,000,000 |
Wells Fargo revolving loans | Maximum |  |  |  |
Long-Term Debt |  |  |  |
Required total liabilities under financial covenants |  |  | 175,000,000 |
American AgCredit term loan |  |  |  |
Long-Term Debt |  |  |  |
Long-term debt |  |  | 22,307,000 | 24,068,000
Interest rate (as a percent) |  |  | 5.00% | 5.25%
Variable rate basis |  |  | 30-day LIBOR |
Interest rate margin (as a percent) |  |  | 4.25% |
Area of the company's real estate pledged as collateral (in acres) |  |  | 3,100 |
Interest rate, variable interest rate floor (as a percent) |  |  | 1.00% |
Principal balance amount the Company is required to pay down to by December 31, 2013 |  |  | 20,000,000 |
Mandatory principal repayment as percentage of the net proceeds of the sale of any real property pledged as collateral |  |  | 100.00% |
Repayment of principal | 1,800,000 | 353,000 |  |
American AgCredit term loan | Minimum |  |  |  |
Long-Term Debt |  |  |  |
Required liquidity under financial covenants |  |  | 4,000,000 |
Mandatory principal repayment as percentage of the net proceeds of the sale of non collateralized real property |  |  | 10.00% |
American AgCredit term loan | Maximum |  |  |  |
Long-Term Debt |  |  |  |
Required total liabilities under financial covenants |  |  | $ 175,000,000 |
Applicable spread after tiered reduction (as a percent) |  |  | 0.0375 |
Mandatory principal repayment as percentage of the net proceeds of the sale of non collateralized real property |  |  | 75.00% |

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