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Equity - Additional Information (Details) |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 30 Months Ended | 50 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 18, 2019 USD ($) | Jul. 16, 2019 shares | Jun. 20, 2019 USD ($) $ / shares shares | May 31, 2018 USD ($) $ / shares shares | Apr. 12, 2017 USD ($) security | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) shares | Dec. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 shares | Jun. 30, 2018 shares | Jan. 10, 2018 shares | Jan. 09, 2018 shares | Dec. 31, 2017 shares | Aug. 07, 2015 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock authorized and unissued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,500,000 |  |  |
Common stock, shares authorized (in shares) | shares |  |  |  |  |  | 91,500,000 | 91,500,000 |  | 91,500,000 | 91,500,000 | 91,500,000 |  |  | 91,500,000 | 98,000,000 |  |
Preferred stock, liquidation value |  |  |  |  |  | $ 86,600,000 | $ 86,600,000 |  | $ 28,600,000 | $ 86,600,000 | $ 86,600,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  |  | 20,888,075 | 20,888,075 |  | 17,891,340 | 20,888,075 | 20,888,075 |  |  |  |  |  |
Common stock, shares outstanding (in shares) | shares |  |  |  |  |  | 20,888,075 | 20,888,075 |  | 17,891,340 | 20,888,075 | 20,888,075 |  |  |  |  |  |
Maximum number of securities that can be sold (in securities) | security |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity |  |  |  |  |  |  | $ 86,070,000 | $ 34,397,000 |  |  |  |  |  |  |  |  |
Discounts and offering expenses |  |  |  |  |  |  | 6,551,000 | $ 1,894,000 |  |  |  |  |  |  |  |  |
Redemptions of Series B Preferred Stock |  |  |  |  |  | $ 48,000 | $ 214,000 |  |  |  |  |  |  |  |  |  |
June 2019 Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities allowed for issuance (amount up to) |  |  | $ 23,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount authorized in Primary Offering (in shares) | shares |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock |  |  | $ 22,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average sales price price (in dollars per share) | $ / shares |  |  | $ 11.73 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of stock | $ 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) | shares |  | 277,297 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity |  |  |  |  |  |  |  |  |  | $ 96,100,000 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  |  | 20,888,075 | 20,888,075 |  | 17,891,340 | 20,888,075 | 20,888,075 |  |  |  |  |  |
Common stock, shares outstanding (in shares) | shares |  |  |  |  |  | 20,888,075 | 20,888,075 | 16,070,616 | 17,891,340 | 20,888,075 | 20,888,075 | 20,532,770 | 16,023,872 |  |  | 13,791,574 |
Common Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  |  | 7,821,886 | 7,821,886 |  |  | 7,821,886 | 7,821,886 |  |  |  |  |  |
Securities allowed for issuance (amount up to) |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Redeemed | shares |  |  |  |  |  |  |  |  |  | 1,215,565 |  |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  |  |  | 6,500,000 | 6,500,000 |  | 6,500,000 | 6,500,000 | 6,500,000 |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |  |  |
Preferred stock, shares issued (in shares) | shares |  |  |  |  |  | 3,465,527 | 3,465,527 |  | 1,144,393 | 3,465,527 | 3,465,527 |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  | 3,465,527 | 3,465,527 |  | 1,144,393 | 3,465,527 | 3,465,527 |  |  |  |  |  |
Series B Preferred Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity |  |  |  |  |  |  |  |  |  | $ 85,600,000 |  |  |  |  |  |  |
Series B Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  | 3,465,527 | 3,465,527 | 393,048 | 1,144,393 | 3,465,527 | 3,465,527 | 2,636,068 | 20,280 |  |  | 0 |
Redemption price (in dollars per share) | $ / shares |  |  |  |  |  | $ 22.50 | $ 22.50 |  |  | $ 22.50 | $ 22.50 |  |  |  |  |  |
Securities allowed for issuance (amount up to) |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount authorized in Primary Offering (in shares) | shares |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate (as percent) |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock |  |  |  | $ 131,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Redeemed | shares |  |  |  |  |  | 2,120 | 9,520 |  |  |  |  |  |  |  |  |  |
Discounts and offering expenses |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of stock |  |  |  |  |  | $ 18,711,000 | 52,440,000 |  |  |  |  |  |  |  |  |  |
Redemptions of Series B Preferred Stock |  |  |  |  |  | $ 48,000 | $ 214,000 |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) | shares |  |  |  |  |  | 831,579 | 2,330,654 |  |  |  |  |  |  |  |  |  |
Weighted-average Offering Price Per Share | $ / shares |  |  |  |  |  | $ 24.64 | $ 24.68 |  |  |  |  |  |  |  |  |  |
Gross proceeds |  |  |  |  |  | $ 20,487,000 | $ 57,529,000 |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock | Preferred Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  |  | 3,475,047 | 3,475,047 |  |  | 3,475,047 | 3,475,047 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of stock |  |  |  |  |  |  |  |  |  |  | $ 22,000,000 |  |  |  |  |  |
Number of shares sold (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 1,744,150 |  |  |  |  |  |
Weighted-average Offering Price Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 12.82 |  |  |  |  |  |
Gross proceeds |  |  |  |  |  |  |  |  |  |  | $ 22,400,000 |  |  |  |  |  |
Common Stock | ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of stock |  |  |  |  |  | $ 923,000 | $ 1,802,000 |  |  |  |  |  |  |  |  |  |
Common stock, value authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000.0
Number of shares sold (in shares) | shares |  |  |  |  |  | 78,008 | 148,559 |  |  |  |  |  |  |  |  |  |
Weighted-average Offering Price Per Share | $ / shares |  |  |  |  |  | $ 12.01 | $ 12.32 |  |  |  |  |  |  |  |  |  |
Gross proceeds |  |  |  |  |  | $ 937,000 | $ 1,830,000 |  |  |  |  |  |  |  |  |  |
OP Unit Holder |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's ownership percent (as percent) |  |  |  |  |  | 98.60% | 98.60% |  | 96.90% | 98.60% | 98.60% |  |  |  |  |  |
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) | shares |  |  |  |  |  |  | 288,303 |  | 570,879 |  |  |  |  |  |  |  |

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