XML 74 R61.htm IDEA: XBRL DOCUMENT
v3.20.2

Subsequent Events - Additional Information (Details) $ in Thousands |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) tenant | Sep. 30, 2020 tenant
Subsequent Event [Line Items] |  |  |
Number of tenants |  | 2 | 73
Group One |  |  |
Subsequent Event [Line Items] |  |  |
Number of tenants |  | 2 |
Maximum |  |  |
Subsequent Event [Line Items] |  |  |
Rent obligations deferred, extension term (in days) |  | 123 days |
Maximum | Group One |  |  |
Subsequent Event [Line Items] |  |  |
Rent obligations deferred, extension term (in days) | 123 days |  |
Collectibility of Annual Rent | Group One |  |  |
Subsequent Event [Line Items] |  |  |
Rent payments deferred | $ | $ 343 | $ 343 |

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- Definition Number of Tenants, Lease Properties + References No definition available. + Details
Name: | land_NumberofTenantsLeaseProperties
Namespace Prefix: | land_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Rent Obligations Deferred, Amount + References No definition available. + Details
Name: | land_RentObligationsDeferredAmount
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Rent Obligations Deferred, Extension Term + References No definition available. + Details
Name: | land_RentObligationsDeferredExtensionTerm
Namespace Prefix: | land_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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 No definition available. + 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: | land_RentDeferralTenantsAxis=land_GroupOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_CollectibilityOfReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |