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Borrowings - Farm Credit Notes Payable (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2018
Farm Credit Notes Payable |
Debt Instrument [Line Items] |
Debt instrument, loans to value ratios percentage | 60.00%

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- Definition Debt Instrument, Loans To Value Ratios Percentage + References No definition available. + Details
Name: | land_DebtInstrumentLoansToValueRatiosPercentage
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=land_FarmCreditNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |