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Long-Term Debt (Details) (USD $) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 31, 2012 | Mar. 31, 2013 acre | Dec. 31, 2012
Long-Term Debt |  |  |
Long-term debt |  | $ 50,968,000 | $ 49,268,000
Less current portion |  | 4,068,000 | 4,068,000
Long-term debt |  | 46,900,000 | 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 |  | 26,900,000 | 25,200,000
Interest rate (as a percent) |  | 4.05% | 4.05%
Maximum borrowing capacity |  | 34,500,000 |
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 |  | 7,100,000 |
Irrevocable letters of credit |  | 500,000 |
Wells Fargo revolving loans | Minimum |  |  |
Long-Term Debt |  |  |
Required liquidity under financial covenants |  | 4,000,000 |
Wells Fargo revolving loans | Maximum |  |  |
Long-Term Debt |  |  |
Required total liabilities under financial covenants |  | 175,000,000 |
American AgCredit term loan, 5.25% |  |  |
Long-Term Debt |  |  |
Long-term debt |  | 24,068,000 | 24,068,000
Interest rate (as a percent) |  | 5.25% | 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% |
Mandatory principal repayment |  | 4,100,000 |
Mandatory principal prepayment as percentage of the net proceeds of the sale of any real property pledged as collateral |  | 100.00% |
Repayment of principal | 353,000 |  |
Sale of non-collateralized real estate parcel | 1,500,000 |  |
American AgCredit term loan, 5.25% | Minimum |  |  |
Long-Term Debt |  |  |
Required liquidity under financial covenants |  | 4,000,000 |
Mandatory principal prepayment as percentage of the net proceeds of the sale of non collateralized real property |  | 10.00% |
American AgCredit term loan, 5.25% | 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 prepayment as percentage of the net proceeds of the sale of non collateralized real property |  | 75.00% |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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