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v3.19.3.a.u2

Subsequent Events - Amendment to 2019 Advisory Agreement (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Subsequent Event [Line Items] |  |
Management fee (as percent) |  | 2.00%
Base management fee, quarterly (as percent) |  | 0.50%
Forecast | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Management fee (as percent) | 0.50% |
Base management fee, quarterly (as percent) | 0.125% |

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- Definition Percentage of expected annual base management fee to aggregate stockholders equity. + References No definition available. + Details
Name: | land_PercentageOfExpectedAnnualBaseManagementFeeToAggregateStockholdersEquity
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Expected Quarterly Base Management Fee To Aggregate Stockholders Equity + References No definition available. + Details
Name: | land_PercentageOfExpectedQuarterlyBaseManagementFeeToAggregateStockholdersEquity
Namespace Prefix: | land_
Data Type: | num:percentItemType
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: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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