XML 42 R30.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Real Estate and Intangible Assets - Additional Information (Details) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 14 Months Ended | 61 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 30, 2018 USD ($) a | Aug. 28, 2018 USD ($) a | Jul. 10, 2018 USD ($) a | Jun. 11, 2018 USD ($) a | Jun. 07, 2018 USD ($) a | Jun. 01, 2017 lease | Sep. 30, 2018 USD ($) a | Mar. 31, 2018 USD ($) lease farm | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) a | Sep. 30, 2018 USD ($) a tenant region farm | Sep. 30, 2017 USD ($) a farm | Sep. 30, 2018 USD ($) a | Jun. 30, 2022 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  |  |  |  |  |  | 82 | 72 |  |
Depreciation expense |  |  |  |  |  |  | $ 2,100,000 |  |  | $ 1,700,000 | $ 6,000,000 | $ 4,400,000 |  |
Tenant improvements, net of depreciation |  |  |  |  |  |  | 2,300,000 |  |  |  | 2,300,000 |  | $ 2,300,000 |
Tenant improvements, depreciation and rental revenue |  |  |  |  |  |  | 77,000 |  |  | 61,000 | 228,000 | 150,000 |  |
Amortization expense related to intangible assets |  |  |  |  |  |  | 289,000 |  |  | 390,000 | 835,000 | 739,000 |  |
Amortization of acquired above market lease values and deferred revenue |  |  |  |  |  |  | 2,000 |  |  | 4,000 | 5,000 | 7,000 |  |
Total accretion related to below-market lease values and deferred revenue |  |  |  |  |  |  | 17,000 |  |  | 17,000 | 50,000 | 47,000 |  |
Operating revenues |  |  |  |  |  |  | 8,013,000 |  |  | 6,561,000 | 21,333,000 | 18,302,000 |  |
Number of leases | lease |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  | $ 443,000 |  |  | $ 386,000 | $ 1,350,000 | $ 1,227,000 |  |
Area of real estate property (in acres) | a |  |  |  |  |  |  | 67,826 |  |  | 61,794 | 67,826 | 61,794 | 67,826 |
Proceeds from dispositions of real estate assets |  |  |  |  |  |  |  |  |  |  | $ 132,000 | $ 0 |  |
Property and casualty loss |  |  |  |  |  |  | $ 0 | $ 129,000 |  | $ 0 | $ 129,000 | $ 0 |  |
Cost to repair damaged properties |  |  |  |  |  |  |  | 81,000 |  |  |  |  |  |
Capitalized real estate addition |  |  |  |  |  |  |  | 34,000 |  |  |  |  |  |
Repairs and maintenance expense |  |  |  |  |  |  |  | $ 47,000 |  |  |  |  |  |
Number of tenants | tenant |  |  |  |  |  |  |  |  |  |  | 56 |  |  |
Percent of rental revenue (as percent) |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |
Tenant A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | $ 3,300,000 |  |  |
Percent of rental revenue (as percent) |  |  |  |  |  |  |  |  |  |  | 15.60% |  |  |
California |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  |  |  |  |  |  | 31 | 27 |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | $ 9,880,000 | $ 8,749,000 |  |
Area of real estate property (in acres) | a |  |  |  |  |  |  | 8,435 |  |  | 7,921 | 8,435 | 7,921 | 8,435 |
Expended or accrued for capital improvements |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |
Percent of rental revenue (as percent) |  |  |  |  |  |  |  |  |  |  | 46.30% | 47.80% |  |
Number of regions farms are located | region |  |  |  |  |  |  |  |  |  |  | 4 |  |  |
Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  |  |  |  |  |  | 22 | 17 |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | $ 5,790,000 | $ 4,839,000 |  |
Area of real estate property (in acres) | a |  |  |  |  | 26 |  | 17,184 |  |  | 11,225 | 17,184 | 11,225 | 17,184 |
Proceeds from dispositions of real estate assets |  |  |  |  | $ 132,000 |  |  |  |  |  |  |  |  |
Percent of rental revenue (as percent) |  |  |  |  |  |  |  |  |  |  | 27.10% | 26.50% |  |
Florida | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 302,000
Morrow County Oregon |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a |  |  | 1,895 |  |  |  |  |  |  |  |  |  |  |
Proceeds from dispositions of real estate assets |  |  | $ 20,500,000 |  |  |  |  |  |  |  |  |  |  |
Closing costs and write-off of deferred rent |  |  | 154,000 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of farm |  |  | $ 6,400,000 |  |  |  |  |  |  |  |  |  |  |
Cochise County, Arizona |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of leases | lease |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Lease term (in years) |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |
Aggregate minimum rents |  |  |  |  |  |  |  | $ 480,000 |  |  |  |  |  |
Decrease in rental income |  |  |  |  |  |  |  | $ 203,000 |  |  |  |  |  |
Decrease in rental revenue (as percent) |  |  |  |  |  |  |  | 29.70% |  |  |  |  |  |
Deferred rent liability |  |  |  |  |  |  |  | $ 84,000 |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | $ 50,000 |  |  |  |  |
Ventura County California |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in rental income | $ 62,000 |  |  | $ 91,000 |  |  |  |  |  |  |  |  |  |
Decrease in rental revenue (as percent) | 16.20% |  |  | 12.00% |  |  |  |  |  |  |  |  |  |
Operating lease, term (in years) |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a | 164 |  |  | 169 |  |  |  |  |  |  |  |  |  |
Annualized straight-line rent |  |  |  | $ 667,000 |  |  |  |  |  |  |  |  |  |
Income tax benefit relating to lease |  |  |  | $ 112,000 |  |  |  |  |  |  |  |  |  |
Santa Cruz County California |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in rental income |  | $ (41,000) |  |  |  |  |  |  |  |  |  |  |  |
Decrease in rental revenue (as percent) |  | (26.00%) |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, term (in years) |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a |  | 72 |  |  |  |  |  |  |  |  |  |  |  |
Annualized straight-line rent |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |
2018 New Real Estate Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  |  |  |  |  |  | 10 |  |  |
Operating revenues |  |  |  |  |  |  | $ 554,000 |  |  |  | $ 603,000 |  |  |
Earnings (loss) recognized |  |  |  |  |  |  | $ (168,000) |  |  |  | $ (140,000) |  |  |
Area of real estate property (in acres) | a |  |  |  |  |  |  | 6,735 |  |  |  | 6,735 |  | 6,735 |
2017 New Real Estate Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  |  |  |  |  |  |  | 14 |  |
Operating revenues |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  | $ 3,000,000 |  |
Earnings (loss) recognized |  |  |  |  |  |  |  |  |  | $ 341,000 |  | $ 1,200,000 |  |
Area of real estate property (in acres) | a |  |  |  |  |  |  |  |  |  | 11,202 |  | 11,202 |  |
2017 New Real Estate Activity | Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  |  |  |  |  |  | $ 748,000 |  |  |  |  |  |

X
- Definition Aggregate Minimum Rents + References No definition available. + Details
Name: | land_AggregateMinimumRents
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amortization of Above Market Lease + References No definition available. + Details
Name: | land_AmortizationOfAboveMarketLease
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cost Of Capitalized And Expensed Repairs And Maintenance + References No definition available. + Details
Name: | land_CostOfCapitalizedAndExpensedRepairsAndMaintenance
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gain Loss On Business Interruption Insurance Recovery + References No definition available. + Details
Name: | land_GainLossOnBusinessInterruptionInsuranceRecovery
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Income Tax Benefit Relating to Lease + References No definition available. + Details
Name: | land_IncomeTaxBenefitRelatingtoLease
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase (Decrease) in Rental Income + References No definition available. + Details
Name: | land_IncreaseDecreaseinRentalIncome
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Lessee leasing arrangement lease term. + References No definition available. + Details
Name: | land_LesseeLeasingArrangementLeaseTerm
Namespace Prefix: | land_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessor, Operating Lease, Annualized Straight Line Rent + References No definition available. + Details
Name: | land_LessorOperatingLeaseAnnualizedStraightLineRent
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of leases. + References No definition available. + Details
Name: | land_NumberOfLeases
Namespace Prefix: | land_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of real estate farms. + References No definition available. + Details
Name: | land_NumberOfRealEstateFarms
Namespace Prefix: | land_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Regions Farms are Located + References No definition available. + Details
Name: | land_NumberofRegionsFarmsareLocated
Namespace Prefix: | land_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Definition Percentage Increase (Decrease) In Rental Revenue + References No definition available. + Details
Name: | land_PercentageIncreaseDecreaseInRentalRevenue
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of rental revenue. + References No definition available. + Details
Name: | land_PercentageOfRentalRevenue
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Real estate properties earnings recognized. + References No definition available. + Details
Name: | land_RealEstatePropertiesEarningsRecognized
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Real estate repair cost capitalized. + References No definition available. + Details
Name: | land_RealEstateRepairCostCapitalized
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sale of Real Estate Assets, Closing Costs and Write-off Of Deferred Rent + References No definition available. + Details
Name: | land_SaleofRealEstateAssetsClosingCostsandWriteoffOfDeferredRent
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tenant Improvements, Depreciation and Rental Revenue + References No definition available. + Details
Name: | land_TenantImprovementsDepreciationandRentalRevenue
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
Name: | us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of increase (decrease) in acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
Name: | us-gaap_BelowMarketLeasePeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_CostOfPropertyRepairsAndMaintenance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
Name: | us-gaap_DeferredRentCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + Details
Name: | us-gaap_GainLossOnSaleOfProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_GeneralAndAdministrativeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919359-209981 + Details
Name: | us-gaap_LessorOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
Name: | us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsForCapitalImprovements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfRealEstate
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 No definition available. + Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_TenantImprovements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_FL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=land_MorrowCountyOregonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=land_CochiseCountyArizonaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=land_VenturaCountyCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=land_SantaCruzCountyCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=land_TwoThousandEighteenNewRealEstateActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=land_TwoThousandSeventeenNewRealEstateActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |