XML 51 R41.htm IDEA: XBRL DOCUMENT
v3.25.1

Commitments and Contingencies (Details) | 3 Months Ended
--- | ---
Mar. 31, 2025 USD ($) dth gal T
Commitments and Contingencies [Line Items] |
Sales contracts valued | $ 9,085,000
Indexed price sales contracts (in US Tons) | T | 19,000
Future commitments for capital projects | $ 10,790,000
Alcohol Sales Contracts [Member] |
Commitments and Contingencies [Line Items] |
Sales contracts valued | $ 170,436,000
Sales Commitments [Member] |
Commitments and Contingencies [Line Items] |
Indexed-price sales (in US Gallons) | gal | 92,716,000
Alcohol From Suppliers [Member] | Purchase Commitments [Member] |
Commitments and Contingencies [Line Items] |
Indexed-price sales (in US Gallons) | gal | 11,766,000
Fixed-price purchase contracts value | $ 278,000
Corn From Suppliers [Member] | Purchase Commitments [Member] |
Commitments and Contingencies [Line Items] |
Fixed-price purchase contracts value | $ 46,233,000
Natural Gas [Member] | Purchase Commitments [Member] |
Commitments and Contingencies [Line Items] |
Indexed-price purchase contracts (in Dekatherms) | dth | 6,743,000

X
- Definition Indexed price purchase contract. + References No definition available. + Details
Name: | alto_IndexedPricePurchaseContract
Namespace Prefix: | alto_
Data Type: | dtr:energyItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indexed-price purchase contracts + References No definition available. + Details
Name: | alto_IndexedPricePurchaseContracts
Namespace Prefix: | alto_
Data Type: | dtr:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indexed price sales contracts. + References No definition available. + Details
Name: | alto_IndexedPriceSalesContract
Namespace Prefix: | alto_
Data Type: | dtr:weightItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=alto_AlcoholSalesContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=alto_SalesCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=alto_AlcoholFromItsSuppliersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=alto_EthanolPurchaseContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=alto_CornFromSuppliersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_NaturalGasProductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |