Annual report pursuant to Section 13 and 15(d)

Borrowings - Principal Payments of Aggregate Borrowings (Detail)

v2.4.1.9
Borrowings - Principal Payments of Aggregate Borrowings (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total $ 86,417,361us-gaap_LongTermDebt $ 43,154,165us-gaap_LongTermDebt
Mortgage Notes and Bonds Payable [Member]    
Debt Instrument [Line Items]    
For the fiscal years ending December 31: 2015 625,680us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_LongtermDebtTypeAxis
= land_MortgageNotesAndBondsPayableMember
 
2016 2,947,300us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= land_MortgageNotesAndBondsPayableMember
 
2017 2,866,043us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= land_MortgageNotesAndBondsPayableMember
 
2018 2,787,631us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= land_MortgageNotesAndBondsPayableMember
 
2019 6,386,962us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_LongtermDebtTypeAxis
= land_MortgageNotesAndBondsPayableMember
 
Thereafter 70,803,745us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_LongtermDebtTypeAxis
= land_MortgageNotesAndBondsPayableMember
 
Total $ 86,417,361us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= land_MortgageNotesAndBondsPayableMember