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Equity - Additional Information (Detail) |  |  |  |  | 3 Months Ended | 12 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 12, 2017 USD ($) security | Mar. 22, 2017 USD ($) shares | Mar. 13, 2017 USD ($) $ / shares shares | Apr. 02, 2014 USD ($) security | Mar. 31, 2017 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2015 shares | Aug. 07, 2015 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  |  |  | 18,000,000 |  | 18,000,000 | 18,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |
Common stock, shares issued (in shares) | shares |  |  |  |  | 11,850,624 |  | 10,024,875 | 11,850,624 |  |
Common stock, shares outstanding (in shares) | shares |  |  |  |  | 11,850,624 |  | 10,024,875 | 11,850,624 |  |
OP units held by non-controlling interest limited partners |  |  |  |  | $ 745,879 |  |  | $ 745,879 |  |
Maximum number of securities that can be sold (in securities) | security |  |  |  | 2 |  |  |  |  |  |
Proceeds from issuance of equity |  |  |  |  | $ 20,722,000 | $ 0 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum number of securities that can be sold (in securities) | security | 2 |  |  |  |  |  |  |  |  |
Registration Statement |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of equity |  |  |  |  |  |  |  | $ 73,100,000 |  |
Number of shares issued (in shares) | shares |  |  |  |  | 0 |  |  |  |  |
Registration Statement | General and administrative expenses |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Professional fees and stockholder-related expenses |  |  |  |  | $ 46,000 |  |  |  |  |
Public offering |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of common stock sold under sale agreement (in shares) | shares |  |  | 1,680,000 |  |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares |  |  | $ 11.35 |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  | $ 19,100,000 |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  | $ 18,000,000 |  |  |  |  |  |  |
Over-allotment option |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of common stock sold under sale agreement (in shares) | shares |  | 145,749 |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  | $ 1,700,000 |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  | $ 1,600,000 |  |  |  |  |  |  |  |
ATM Program |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  | 64,561 |  |  | 64,561 |  |
Common stock, value authorized |  |  |  |  |  |  |  |  |  | $ 30,000,000.0
Average sales price price (in dollars per share) | $ / shares |  |  |  |  | $ 10.23 |  |  | $ 10.23 |  |
Common stock, value, outstanding |  |  |  |  | $ 660,000 |  |  | $ 660,000 |  |
Common stock, value, issued |  |  |  |  |  |  | $ 650,000 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | shares |  |  |  |  | 11,850,624 |  | 10,024,875 | 11,850,624 | 9,992,941 |
Number of shares issued (in shares) | shares |  |  |  |  | 1,825,749 |  | 31,934 |  |  |
Common Stock | Registration Statement |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  | 4,013,763 |  |  | 4,013,763 |  |
Securities allowed for issuance (amount up to) |  |  |  | $ 300,000,000 |  |  |  |  |  |
Common Stock | Registration Statement | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Securities allowed for issuance (amount up to) | $ 300,000,000 |  |  |  |  |  |  |  |  |
Preferred Stock | Registration Statement |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  | 1,150,000 |  |  | 1,150,000 |  |
Gladstone Land Limited Partnership |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Company's ownership percent (as percent) |  |  |  |  | 89.10% |  | 87.40% | 89.10% |  |
OP units held by non-controlling limited partners (in shares) | shares |  |  |  |  | 1,449,258 |  | 1,449,258 |  |  |

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