Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Details)

v3.19.2
Related-Party Transactions - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jan. 10, 2018
Apr. 01, 2017
Jun. 30, 2019
USD ($)
a
Jun. 30, 2018
USD ($)
a
Jun. 30, 2019
USD ($)
a
officer
Jun. 30, 2018
USD ($)
a
Dec. 31, 2018
USD ($)
Aug. 01, 2018
Jul. 31, 2018
a
Oct. 17, 2017
USD ($)
a
Related Party Transaction [Line Items]                    
Administration fee     $ 250,000   $ 250,000   $ 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%              
Cumulative realized capital gains (as percent)   15.00%                
Credits to fees from adviser     $ 974,000 $ 174,000 $ 1,543,000 $ 174,000        
Administration fee     250,000 275,000 556,000 549,000        
Selling commissions and dealer-manager fees     1,659,000 50,000 3,313,000 50,000        
Base management fee     $ 974,000 $ 754,000 $ 1,879,000 $ 1,411,000        
Total Acres | a     75,886 63,325 75,886 63,325        
Selling commissions and dealer-manager fees, paid to third parties to date, percentage     94.00%   94.00%          
Gladstone Securities                    
Related Party Transaction [Line Items]                    
Administration fee     $ 26,000 $ 2,000 $ 28,000 $ 2,000        
Financing fee (as percent)         0.12%          
Taxable REIT Subsidiary                    
Related Party Transaction [Line Items]                    
Administration fee             $ 9,000      
Administration fee       17,000   30,000        
Base management fee       94,000   161,000        
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%                  
Selling commissions and dealer-manager fees     1,700,000              
Payment of management fees         $ 3,300,000          
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       94,000   161,000        
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]                    
Face amount of debt     81,000   81,000          
Payment of management fees     $ 1,600,000 $ 50,000 $ 3,100,000 $ 47,000        
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%