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Subsequent Events - Additional Information (Details) - Subsequent Event - USD ($) $ in Thousands |  |  | 1 Months Ended
--- | --- | --- | ---
Jul. 18, 2019 | Jul. 16, 2019 | Aug. 07, 2019
Series B Preferred Stock |  |  |
Subsequent Event [Line Items] |  |  |
Sale of stock sold under sale agreement (in shares) |  |  | 229,294.000
Gross proceeds from issuance of stock |  |  | $ 5,700
Net proceeds from issuance of stock |  |  | 5,200
Gladstone Securities |  |  |
Subsequent Event [Line Items] |  |  |
Dividends, preferred stock, stock |  |  | 527
Over-Allotment Option [Member] | Common Stock |  |  |
Subsequent Event [Line Items] |  |  |
Sale of stock sold under sale agreement (in shares) |  | 277,297 |
Gross proceeds from issuance of stock | $ 3,300 |  |
Net proceeds from issuance of stock | $ 3,100 |  |
Unrelated third-parties | Gladstone Securities |  |  |
Subsequent Event [Line Items] |  |  |
Dividends, preferred stock, stock |  |  | $ 499

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- Definition Sale of Stock, Consideration Received on Transaction, Gross + References No definition available. + Details
Name: | land_SaleofStockConsiderationReceivedonTransactionGross
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Sale of Stock, Offering Costs + References No definition available. + Details
Name: | land_SaleofStockOfferingCosts
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
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
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- Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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