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EQUITY - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 30 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2020 $ / shares shares | Apr. 01, 2020 USD ($) security | Jan. 31, 2021 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Dec. 31, 2021 $ / shares shares | Sep. 30, 2022 USD ($) $ / shares shares | Aug. 24, 2022 shares | May 18, 2021 USD ($) | May 12, 2020 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  | 34,704,005 |  | 34,704,005 |  | 34,210,013 | 34,704,005 |  |  |
Write-off of unamortized deferred offering costs associated with cumulative redeemable preferred stock (Series C) | $ |  |  |  |  |  | $ 798 | $ 0 |  |  |  |  |
Fair value of preferred stock | $ |  |  |  |  | $ 4,000 |  | $ 4,000 |  |  |  |  |
Weighted average issuance price per OP unit (in dollars per share) | $ / shares |  |  |  | 37.45 |  | 37.45 | 19.42 |  |  |  |  |
Payments for repurchase of redeemable preferred stock | $ |  |  |  |  |  | $ 7,700 |  |  |  |  |  |
Gladstone Land Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
OP units held by non-controlling limited partners (in shares) |  |  |  |  |  | 0 | 204,778 | 204,778 |  |  |  |
OP units redeemed (in shares) |  |  |  |  |  | 204,778 |  |  |  |  |  |
OP Unit Holder |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company's ownership |  |  |  | 100.00% |  | 100.00% |  | 99.40% | 100.00% |  |  |
Minimum period required to exercise, in months |  |  |  |  |  | 12 months |  |  |  |  |  |
Operating units, conversion ratio |  |  |  |  |  | 1 |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 8,992,776 |  | 8,992,776 |  | 3,493,333 | 8,992,776 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 25,967,227 |  | 25,967,227 |  | 25,989,942 | 25,967,227 |  |  |
Shares tendered for optional redemption (in shares) |  |  |  | 18,075 | 9,920 | 22,715 | 9,920 |  |  |  |  |
Shares tendered for optional redemption, cash payment | $ |  |  |  | $ 420 | $ 248 | $ 531 | $ 248 |  |  |  |  |
Series C Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of securities can be sold under shelf registration statement (in shares) | 26,000,000 |  |  |  |  |  |  |  |  |  |  |
Dividend rate | 6.00% |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 20,000,000 |  |  |  |  |  |  |  |  | 10,200,000 |  |
Average sales price of common stock sold (in dollars per share) | $ / shares | $ 25.00 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized, pursuant to DRIP (in shares) | 6,000,000 |  |  |  |  |  |  |  |  | 200,000 |  |
Sale of stock pursuant to DRIP (in dollars per share) | $ / shares | $ 22.75 |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of stock, excluding selling commissions and dealer-manager fees | $ |  |  |  |  |  | $ 1,400 |  |  |  |  |  |
Write-off of unamortized deferred offering costs associated with cumulative redeemable preferred stock (Series C) | $ |  |  |  | $ 798 |  |  |  |  |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  | 2,415,000 | 2,415,000 |  | 2,415,000 |  | 2,415,000 | 2,415,000 |  |  |
Dividend rate |  |  | 5.00% |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 3,600,000 |  | 3,600,000 |  | 3,600,000 | 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 |  |  |  |  |  |  |  |  |
2020 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Securities allowed for issuance | $ |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Maximum number of securities that can be sold | security |  | 2 |  |  |  |  |  |  |  |  |  |
2020 Registration Statement | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  |  | $ 260,600 |  |  |
Common stock, shares issued (in shares) |  |  |  | 13,357,547 |  | 13,357,547 |  |  | 13,357,547 |  |  |
2020 Registration Statement | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 9,025,549 |  | 9,025,549 |  |  | 9,025,549 |  |  |
2020 Registration Statement | Series C Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  |  | $ 223,600 |  |  |
2020 Registration Statement | Series D Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 2,415,000 |  | 2,415,000 |  |  | 2,415,000 |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  |  | $ 60,400 |  |  |
ATM Program | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, value authorized | $ |  |  |  |  |  |  |  |  |  |  | $ 260,000 | $ 100,000
Common stock, additional value authorized | $ |  |  |  |  |  |  |  |  |  |  | $ 160,000 |

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