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Subsequent Events - Portfolio Activity (Details) - Subsequent Event acre ft in Thousands, $ in Thousands | Oct. 09, 2023 USD ($) acre ft
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Subsequent Event [Line Items] |
Water transfer agreement, purchase volume per water year (in acre-feet) | acre ft | 15
Water transfer agreement, initial consideration | $ | $ 750
Water transfer agreement, purchase volume during current water year (in acre-feet) | acre ft | 7
Payment for water acquisition | $ | $ 1,200

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- Definition Payment For Water Acquisition + References No definition available. + Details
Name: | land_PaymentForWaterAcquisition
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Water Transfer Agreement, Initial Consideration + References No definition available. + Details
Name: | land_WaterTransferAgreementInitialConsideration
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Water Transfer Agreement, Purchase Volume During Current Water Year + References No definition available. + Details
Name: | land_WaterTransferAgreementPurchaseVolumeDuringCurrentWaterYear
Namespace Prefix: | land_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | instant

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- Definition Water Transfer Agreement, Purchase Volume Per Water Year + References No definition available. + Details
Name: | land_WaterTransferAgreementPurchaseVolumePerWaterYear
Namespace Prefix: | land_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483399/855-10-50-2 + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |