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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 |  |  |  |  |

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