Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Details)

v3.19.1
Related-Party Transactions - Additional Information (Details)
 3 Months Ended
Jan. 10, 2018
Apr. 01, 2017
Mar. 31, 2019
USD ($)
a
officer
Mar. 31, 2018
USD ($)
a
Dec. 31, 2018
USD ($)
Jul. 31, 2018
a
Jun. 11, 2018
Oct. 17, 2017
USD ($)
a
Related Party Transaction [Line Items]                
Administration fee     $ 306,000   $ 340,000      
Number of executive officers that serve as directors | officer     2          
Management fee (as percent)   2.00%            
Hurdle rate, quarterly (as percent)   1.75%            
Hurdle rate, annual (as percent)   7.00%            
Pre-Incentive Fee FFO (as percent)   100.00%            
Pre-Incentive Fee, exceeded (as percent)   2.1875%            
Pre-Incentive Fee, exceeded, annual (as percent)   8.75%            
Pre-Incentive Fee (as percent)   20.00%            
Base management fee, quarterly (as percent)   0.50%            
Base management fee, waiver credit granted by related party     $ 568,700          
Cumulative realized capital gains (as percent)   15.00%            
Credits to fees from adviser     569,000 $ 0        
Administration fee     306,000 274,000        
Base management fee     $ 905,000 $ 656,000        
Total Acres | a     73,900 63,351        
Selling commissions and dealer-manager fees, paid to third parties to date, percentage     93.90%          
Gladstone Securities                
Related Party Transaction [Line Items]                
Administration fee     $ 2,000          
Financing fee (as percent)     0.12%          
Taxable REIT Subsidiary                
Related Party Transaction [Line Items]                
Administration fee     $ 9,000          
Administration fee     12,000 $ 12,000        
Base management fee     66,000          
Preferred Stock | Series B Preferred Stock                
Related Party Transaction [Line Items]                
Selling commission fee (as percent) 7.00%              
Dealer-manager fee (as percent) 3.00%              
Payment of management fees     1,654,000          
Ventura County California                
Related Party Transaction [Line Items]                
Operating lease, term (in years)             10 years  
Total Acres | a           169   169
Land Advisers | Taxable REIT Subsidiary                
Related Party Transaction [Line Items]                
Base management fee       $ 66,000        
Land Advisers | Unsecured Debt [Member]                
Related Party Transaction [Line Items]                
Face amount of debt               $ 1,700,000
Stated interest rate (as percent)               5.00%
Gladstone Securities                
Related Party Transaction [Line Items]                
Payment of management fees     $ 1,557,000          
Gladstone Securities | Minimum | Gladstone Securities                
Related Party Transaction [Line Items]                
Financing fee (as percent)     0.50%          
Gladstone Securities | Maximum | Gladstone Securities                
Related Party Transaction [Line Items]                
Financing fee (as percent)     1.00%