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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Related Party Transaction [Line Items] |  |
Base management fee | $ 905,000 | $ 656,000
Credits to fees from Adviser | (569,000) | 0
Total fees to our Adviser, net | 336,000 | 656,000
Administration fee | 306,000 | 274,000
Selling commissions and dealer-manager fees | 1,654,000 | 0
Financing fees | 2,000 | 0
Total fees to Gladstone Securities | 1,656,000 | 0
Taxable REIT Subsidiary |  |
Related Party Transaction [Line Items] |  |
Base management fee | 66,000 |
Administration fee | 12,000 | $ 12,000
Gladstone Securities |  |
Related Party Transaction [Line Items] |  |
Administration fee | $ 2,000 |
Gladstone Securities | Gladstone Securities |  |
Related Party Transaction [Line Items] |  |
Financing fees as percentage of total financings secured | 0.15% |

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- Definition Administration fee. + References No definition available. + Details
Name: | land_AdministrationFee
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Credits to fees from adviser. + References No definition available. + Details
Name: | land_CreditsToFeesFromAdviser
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Financing Fee + References No definition available. + Details
Name: | land_FinancingFee
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Financing Fees As Percentage Of Total Financings Secured + References No definition available. + Details
Name: | land_FinancingFeesAsPercentageOfTotalFinancingsSecured
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Management Fees and Financing Fees + References No definition available. + Details
Name: | land_ManagementFeesandFinancingFees
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related party transaction net incentive fees paid and credits received. + References No definition available. + Details
Name: | land_RelatedPartyTransactionNetIncentiveFeesPaidAndCreditsReceived
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Selling Commissions and Dealer-Manager Fees + References No definition available. + Details
Name: | land_SellingCommissionsandDealerManagerFees
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_ManagementFeeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=land_TaxableREITSubsidiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=land_GladstoneSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |