XML 71 R53.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Related-Party Transactions - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Feb. 20, 2020 | Dec. 31, 2023 USD ($) officer | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Number of executive officers that serve as directors | officer |  | 2 |  |
Hurdle rate, quarterly |  | 1.75% |  |
Hurdle rate, annual |  | 7.00% |  |
Pre-incentive Fee FFO |  | 100.00% |  |
Pre-Incentive Fee, exceeded |  | 2.1875% |  |
Pre-Incentive Fee, exceeded, annual |  | 8.75% |  |
Pre-incentive fee |  | 20.00% |  |
Multiplier |  | 300.00% |  |
Period prior to termination |  | 24 months |  |
Prior Advisory Agreement |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management fee |  | 0.50% |  |
Base management fee, quarterly |  | 0.125% |  |
Financing Arrangement Agreement, Percentage Of Financing Fees Paid |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate |  | 0.14% |  |
Preferred Stock | Series C Preferred Stock | Dealer-Manager Agreements, Selling Commissions of Gross Proceeds from Sales |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate | 6.00% |  |  |
Preferred Stock | Series C Preferred Stock | Dealer-Manager Agreements, Dealer-Manager Fee of Gross Proceeds from Sales |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate | 3.00% |  |  |
Preferred Stock | Series E Preferred Stock | Dealer-Manager Agreements, Selling Commissions of Gross Proceeds from Sales |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate | 7.00% |  |  |
Preferred Stock | Series E Preferred Stock | Dealer-Manager Agreements, Dealer-Manager Fee of Gross Proceeds from Sales |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate | 3.00% |  |  |
Gladstone Securities | Financing Fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | $ |  | $ 0 | $ 154,000 | $ 166,000
Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Written notice |  | 120 days |  |
Gladstone Securities | Advisory Agreement - Base Rate, Annualized Rate |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, base rate |  | 0.60% |  |
Gladstone Securities | Advisory Agreement - Base Rate, Quarterly Rate |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, base rate |  | 0.15% |  |
Gladstone Securities | Advisory Agreement - Incentive Rate, Realized Capital Gains |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, incentive rate |  | 15.00% |  |
Gladstone Securities | Minimum | Financing Arrangement Agreement, Percentage Of Financing Obtained |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate |  | 0.50% |  |
Gladstone Securities | Maximum | Financing Arrangement Agreement, Percentage Of Financing Obtained |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate |  | 1.00% |  |

X
- Definition Amount to be paid to adviser in percentage of pre incentive fee condition one. + References No definition available. + Details
Name: | land_AmountToBePaidToAdviserInPercentageOfPreIncentiveFeeConditionOne
Namespace Prefix: | land_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount to be paid to adviser in percentage of pre incentive fee condition two. + References No definition available. + Details
Name: | land_AmountToBePaidToAdviserInPercentageOfPreIncentiveFeeConditionTwo
Namespace Prefix: | land_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Annualized incentive fee per advisory agreement. + References No definition available. + Details
Name: | land_AnnualizedIncentiveFeePerAdvisoryAgreement
Namespace Prefix: | land_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Incentive fee per advisory agreement. + References No definition available. + Details
Name: | land_IncentiveFeePerAdvisoryAgreement
Namespace Prefix: | land_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum annual percentage of stockholders equity to pay full pre incentive fee to adviser. + References No definition available. + Details
Name: | land_MaximumAnnualPercentageOfStockholdersEquityToPayFullPreIncentiveFeeToAdviser
Namespace Prefix: | land_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Notice Period For Termination Of Agreement Without Cause + References No definition available. + Details
Name: | land_NoticePeriodForTerminationOfAgreementWithoutCause
Namespace Prefix: | land_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Executive Officers That Serve As Directors + References No definition available. + Details
Name: | land_NumberofExecutiveOfficersThatServeAsDirectors
Namespace Prefix: | land_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Pre incentive fee in percentage of common stockholders equity that awards adviser hundred percent of amount of pre incentive fee maximum percentage. + References No definition available. + Details
Name: | land_PreIncentiveFeeInPercentageOfCommonStockholdersEquityThatAwardsAdviserHundredPercentOfAmountOfPreIncentiveFeeMaximumPercentage
Namespace Prefix: | land_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Termination Agreement, Multiplier For Average Annual Base Management Fee + References No definition available. + Details
Name: | land_TerminationAgreementMultiplierForAverageAnnualBaseManagementFee
Namespace Prefix: | land_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Termination Agreement, Period Prior To Termination + References No definition available. + Details
Name: | land_TerminationAgreementPeriodPriorToTermination
Namespace Prefix: | land_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Base rate for management and service fees under arrangement to manage operations, including, but not limited to, investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
Name: | us-gaap_ManagementAndServiceFeesBaseRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rate based on performance for management and service fees under arrangement to manage operations, including, but not limited to, investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
Name: | us-gaap_ManagementAndServiceFeesIncentiveRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483326/850-10-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483326/850-10-50-3 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)(2)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)(2)(ii)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(g)(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesEPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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

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