Quarterly report pursuant to Section 13 or 15(d)

Equity - Additional Information (Details)

v3.21.2
Equity - Additional Information (Details)
 1 Months Ended 6 Months Ended 12 Months Ended 15 Months Ended
Apr. 03, 2020
$ / shares
shares
Apr. 01, 2020
USD ($)
security
May 31, 2018
$ / shares
Jan. 31, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2020
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
May 18, 2021
USD ($)
May 12, 2020
USD ($)
Subsidiary, Sale of Stock [Line Items]                    
Proceeds from issuance of preferred and common equity | $         $ 109,720,000 $ 39,563,000        
Common stock, shares issued (in shares)         30,478,064   26,219,019 30,478,064    
2020 Registration Statement                    
Subsidiary, Sale of Stock [Line Items]                    
Securities allowed for issuance (amount up to) | $   $ 1,000,000,000.0                
Maximum number of securities that can be sold (in securities) | security   2                
Common Stock | 2020 Registration Statement                    
Subsidiary, Sale of Stock [Line Items]                    
Proceeds from issuance of preferred and common equity | $               $ 154,200,000    
Common stock, shares issued (in shares)         8,843,303     8,843,303    
Shares of common stock issued (in shares)               288,303    
Series D Preferred Stock                    
Subsidiary, Sale of Stock [Line Items]                    
Dividend rate (as percent)       5.00%            
Preferred stock, shares issued (in shares)       2,415,000 2,415,000   0 2,415,000    
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.001 $ 0.001   $ 0.001 $ 0.001    
Preferred stock, shares authorized (in shares)         3,600,000   0 3,600,000    
Series D Preferred Stock | Preferred Stock                    
Subsidiary, Sale of Stock [Line Items]                    
Proceeds from issuance of preferred and common equity | $       $ 58,300,000            
Series D Preferred Stock | Preferred Stock | 2020 Registration Statement                    
Subsidiary, Sale of Stock [Line Items]                    
Preferred stock, shares issued (in shares)         2,415,000     2,415,000    
Proceeds from issuance of preferred and common equity | $               $ 60,400,000    
Series C Preferred Stock                    
Subsidiary, Sale of Stock [Line Items]                    
Preferred stock, shares issued (in shares)         2,029,455   1,088,435 2,029,455    
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.001   $ 0.001 $ 0.001    
Preferred stock, shares authorized (in shares)         25,999,862   25,999,862 25,999,862    
Series C Preferred Stock | 2020 Registration Statement                    
Subsidiary, Sale of Stock [Line Items]                    
Preferred stock, shares issued (in shares)         2,029,593     2,029,593    
Series C Preferred Stock | Preferred Stock                    
Subsidiary, Sale of Stock [Line Items]                    
Dividend rate (as percent) 6.00%                  
Maximum amount of securities can be sold under shelf registration statement (in shares) 26,000,000                  
Preferred stock, par value (in dollars per share) | $ / shares $ 0.001                  
Average sales price of common stock sold (in dollars per share) | $ / shares $ 25.00                  
Gross proceeds | $         $ 23,315,000          
Preferred stock, shares authorized (in shares) 20,000,000                  
Sale of stock pursuant to DRIP (in dollars per share) | $ / shares $ 22.75                  
Preferred stock, shares authorized, pursuant to DRIP (in shares) 6,000,000                  
Net proceeds from issuance of stock, excluding selling commissions and dealer-manager fees | $         $ 408,000          
Preferred stock, shares issued, pursuant to DRIP (in shares)         2,001          
Series C Preferred Stock | Preferred Stock | 2020 Registration Statement                    
Subsidiary, Sale of Stock [Line Items]                    
Proceeds from issuance of preferred and common equity | $               $ 50,400,000    
Series C Preferred Stock | Preferred Stock | Series C Termination                    
Subsidiary, Sale of Stock [Line Items]                    
Preferred stock, shares authorized (in shares) 20,000,000                  
Series B Preferred Stock                    
Subsidiary, Sale of Stock [Line Items]                    
Preferred stock, shares issued (in shares)         5,956,065   5,956,065 5,956,065    
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.001   $ 0.001 $ 0.001    
Preferred stock, shares authorized (in shares)         6,456,065   6,456,065 6,456,065    
Series B Preferred Stock | Preferred Stock                    
Subsidiary, Sale of Stock [Line Items]                    
Dividend rate (as percent)     6.00%              
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.001              
Common Stock | ATM Program                    
Subsidiary, Sale of Stock [Line Items]                    
Gross proceeds | $         $ 86,405,000          
Common stock, value authorized | $                 $ 260,000,000.0 $ 100,000,000.0
Common stock, additional value authorized | $                 $ 160,000,000.0  
OP Unit Holder                    
Subsidiary, Sale of Stock [Line Items]                    
Company's ownership percent (as percent)         99.30%   100.00% 99.30%    
Minimum period required to exercise, in months         12 months          
Gladstone Land Limited Partnership                    
Subsidiary, Sale of Stock [Line Items]                    
OP units held by non-controlling limited partners (in shares)         204,778   0      
Gladstone Land Limited Partnership | Limited Partner                    
Subsidiary, Sale of Stock [Line Items]                    
OP Units tendered for redemption (in shares)         0