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Equity - Schedule of OP Units Issued (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares
Equity [Abstract]
Number of OP Units Issued	$ 288,303
Weighted-average Issuance Price | $ / shares	11.41
Aggregate Value	$ 3,290,000

X

- Definition

Partners' Capital Account, Units Issued

+ References

No definition available.

+ Details

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Namespace Prefix:	land_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Partners' Capital Account, Weighted-Average Issuance Price

+ References

No definition available.

+ Details

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Namespace Prefix:	land_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Fair value portion of shares that an entity is required to redeem for cash or other assets at a fixed or determinable date or upon the occurrence of an event.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e21216-110875

+ Details

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