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Commitments and Contingencies - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) lease	Jun. 30, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Number of leases | lease			3
Lease expense | $	$ 22	$ 12	$ 36	$ 24

X

- Definition

Finance Lease, Cost

+ References

No definition available.

+ Details

Name:	land_FinanceLeaseCost
Namespace Prefix:	land_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

- References

No definition available.

+ Details

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