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SUBSEQUENT EVENTS - Additional Information (Details) - Prior Advisory Agreement	9 Months Ended
	Sep. 30, 2021
Subsequent Event [Line Items]
Management fee	0.50%
Base management fee, quarterly	0.125%

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-types: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-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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