Quarterly report pursuant to Section 13 or 15(d)

Equity - Additional Information (Details)

v3.21.1
Equity - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended 48 Months Ended
Jan. 13, 2021
shares
Apr. 03, 2020
$ / shares
shares
Apr. 01, 2020
USD ($)
security
Mar. 09, 2020
USD ($)
shares
May 31, 2018
USD ($)
$ / shares
shares
Jan. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
May 12, 2020
USD ($)
Subsidiary, Sale of Stock [Line Items]                      
Stock authorized and unissued (in shares) 3,600,000                    
Proceeds from issuance of preferred and common equity | $             $ 35,868,000 $ 35,589,000      
Common stock, shares issued (in shares)             27,531,951   26,219,019 27,531,951  
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 | $                   $ 90,300,000  
Common stock, shares issued (in shares)             5,897,190     5,897,190  
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]                      
Dividend rate (as percent) 5.00%                    
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)             1,624,113   1,088,435 1,624,113  
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)             1,624,251     1,624,251  
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 | $             $ 13,315,000        
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 | $             $ 301,000        
Series C Preferred Stock | Preferred Stock | 2020 Registration Statement                      
Subsidiary, Sale of Stock [Line Items]                      
Proceeds from issuance of preferred and common equity | $                   $ 40,300,000  
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%            
Securities allowed for issuance (amount up to) | $         $ 150,000,000.0            
Maximum amount of securities can be sold under shelf registration statement (in shares)         6,000,000            
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            
Series B Preferred Stock | Preferred Stock | Series B Termination                      
Subsidiary, Sale of Stock [Line Items]                      
Securities allowed for issuance (amount up to) | $       $ 147,500,000              
Maximum amount of securities can be sold under shelf registration statement (in shares)       6,000,000              
Gross proceeds | $       $ 133,400,000              
Common Stock | ATM Program                      
Subsidiary, Sale of Stock [Line Items]                      
Gross proceeds | $             $ 22,537,000        
Common stock, value authorized | $                     $ 100,000,000.0
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