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Equity - Additional Information (Details) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 39 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2020 $ / shares shares | Apr. 01, 2020 USD ($) security | Mar. 05, 2020 USD ($) shares | Feb. 20, 2020 $ / shares shares | May 31, 2018 $ / shares shares | Apr. 12, 2017 USD ($) security | Aug. 05, 2020 USD ($) shares | May 06, 2020 shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) shares | Dec. 31, 2019 $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | May 12, 2020 USD ($) | Mar. 31, 2020 shares | Feb. 19, 2020 shares | Mar. 31, 2019 shares | Dec. 31, 2018 shares | Aug. 07, 2015 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock authorized and unissued (in shares) |  |  |  | 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 65,500,000 |  |  |  |  | 65,527,518 |  | 65,527,518 |  | 91,514,600 | 65,527,518 |  |  | 91,500,000 |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 21,534,739 |  | 21,534,739 |  | 20,936,658 | 21,534,739 |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  | 21,534,739 |  | 21,534,739 |  | 20,936,658 | 21,534,739 |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  |  |  |  | $ 39,563,000 | $ 61,394,000 |  |  |  |  |  |  |  |
2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of securities that can be sold (in securities) | security |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 117,400,000 |  |  |  |  |  |
2020 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of securities that can be sold (in securities) | security |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  |  | $ 714,000,000 |  |  |  |  |  |  |  |  |  |  |
Allowance for credit loss, writeoff | $ |  |  |  |  |  |  |  |  |  |  | $ 29,000,000 |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  | 21,534,739 | 20,532,770 | 21,534,739 | 20,532,770 | 20,936,658 | 21,534,739 |  | 21,346,458 |  | 18,462,219 | 17,891,340 |
Common Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 9,495,834 |  | 9,495,834 |  |  | 9,495,834 |  |  |  |  |  |
Securities allowed for issuance (amount up to) | $ |  |  |  |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,215,565 |  |  |  |  |  |
Common Stock | 2020 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 44,129 |  | 44,129 |  |  | 44,129 |  |  |  |  |  |
Securities allowed for issuance (amount up to) | $ |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued (in shares) |  |  |  |  |  |  |  |  | 144,152 |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  |  |  | 6,472,482 |  | 6,472,482 |  | 6,485,400 | 6,472,482 |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 5,972,482 |  | 5,972,482 |  | 4,755,869 | 5,972,482 |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  | 5,972,482 |  | 5,972,482 |  | 4,755,869 | 5,972,482 |  |  |  |  |  |
Redemptions of Series B Preferred Stock | $ |  |  |  |  |  |  |  |  | $ 124,000 | $ 153,000 | $ 309,000 | $ 166,000 |  |  |  |  |  |  |  |
Series B Preferred Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 147,500,000 |  |  |  |  |  |
Series B Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate (as percent) |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  | 5,972,482 | 2,636,068 | 5,972,482 | 2,636,068 | 4,755,869 | 5,972,482 |  | 5,977,647 |  | 1,891,709 | 1,144,393 |
Average sales price of common stock sold (in dollars per share) | $ / shares |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock redeemed (in shares) |  |  |  |  |  |  |  |  | 5,165 | 6,800 | 12,918 | 7,400 |  |  |  |  |  |  |  |
Redemptions of Series B Preferred Stock | $ |  |  |  |  |  |  |  |  | $ 123,000 | $ 153,000 | $ 309,000 | $ 166,000 |  |  |  |  |  |  |  |
Maximum amount of securities can be sold under shelf registration statement (in shares) |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds | $ |  |  |  |  |  |  |  |  |  | 18,560,000 | 30,148,000 | 37,042,000 |  |  |  |  |  |  |  |
Net proceeds from issuance of stock | $ |  |  |  |  |  |  |  |  |  | 16,901,000 | $ 27,664,000 | 33,729,000 |  |  |  |  |  |  |  |
Series B Preferred Stock | Preferred Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 6,000,000 |  | 6,000,000 |  |  | 6,000,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of stock | $ |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  |  |  | 26,000,000 |  | 26,000,000 |  | 0 | 26,000,000 |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 130,702 |  | 130,702 |  | 0 | 130,702 |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  | 130,702 |  | 130,702 |  | 0 | 130,702 |  |  |  |  |  |
Series C Preferred Stock | 2020 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  |  | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |
Series C Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate (as percent) |  |  |  | 6.00% | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 20,000,000 |  |  | 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  | 130,702 |  | 130,702 |  |  | 130,702 |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares | $ 25.00 |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized, pursuant to DRIP (in shares) | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of securities can be sold under shelf registration statement (in shares) | 26,000,000 |  |  | 400,000 |  |  |  | 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds | $ |  |  |  |  |  |  |  |  |  |  | $ 3,260,000 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of stock | $ |  |  |  |  |  |  |  |  |  |  | 2,973,000 |  |  |  |  |  |  |  |  |
Sale of stock pursuant to DRIP (in dollars per share) | $ / shares | $ 22.75 |  |  | $ 22.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of stock, excluding selling commissions and dealer-manager fees | $ |  |  |  |  |  |  |  |  |  |  | $ 302,000 |  |  |  |  |  |  |  |  |
Series C Preferred Stock | Preferred Stock | 2020 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 130,702 |  | 130,702 |  |  | 130,702 |  |  |  |  |  |
Series C Preferred Stock | Preferred Stock | Series C Termination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock | ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds | $ |  |  |  |  |  |  |  |  | $ 714,000 | 893,000 | $ 6,155,000 | 893,000 |  |  |  |  |  |  |  |
Net proceeds from issuance of stock | $ |  |  |  |  |  |  |  |  | $ 707,000 | $ 879,000 | $ 6,094,000 | $ 879,000 |  |  |  |  |  |  |  |
Common stock, value authorized | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  | $ 30,000,000.0
OP Unit Holder |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's ownership percent (as percent) |  |  |  |  |  |  |  |  | 99.30% |  | 99.30% |  | 98.60% | 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) |  |  |  |  |  |  |  |  |  |  | 144,151 |  | 288,303 |  |  |  |  |  |  |
Subsequent Event | Series B Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock redeemed (in shares) |  |  |  |  |  |  | 1,297 |  |  |  |  |  |  |  |  |  |  |  |  |
Redemptions of Series B Preferred Stock | $ |  |  |  |  |  |  | $ 29,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Series C Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  | 3,360,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  | $ 5,527,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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