XML 48 R80.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Subsequent Events - Amendment to 2019 Advisory Agreement (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Management fee (as percent)		2.00%
Base management fee, quarterly (as percent)		0.50%
Forecast | Subsequent Event
Subsequent Event [Line Items]
Management fee (as percent)	0.50%
Base management fee, quarterly (as percent)	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:	num: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:	num: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:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: