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Subsequent Events - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 07, 2019 USD ($) | Jan. 22, 2019 USD ($) a option | Feb. 25, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) a shares | Dec. 31, 2017 USD ($) a shares
Subsequent Event [Line Items] |  |  |  |  |
Total Acres | a |  |  |  | 73,205 | 63,014
Financing fee |  |  |  | $ 83 | $ 36
Base management fee |  |  |  | 2,837 | 2,041
Payment of management fees |  |  |  |  | 0
Redemption of preferred stock |  |  |  | 523 | $ 2,569
695-acre farm in Lincoln County, Nebraska | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Total Acres | a |  | 695 |  |  |
Purchase price |  | $ 2,400 |  |  |
Lease term (in years) |  | 5 years |  |  |
Number of renewal options | option |  | 1 |  |  |
Rental revenue |  | $ 126 |  |  |
Farm Credit West Note Payable due 2043 | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Proceeds from notes payable | $ 1,400 |  |  |  |
Interest rate (as percent) | 5.45% |  |  |  |
Debt Financing Costs | Gladstone Securities | Farm Credit West Note Payable due 2043 | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Financing fee | $ 2 |  |  |  |
Series B Preferred Stock | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Sale of stock sold under sale agreement (in shares) | shares |  |  | 454,075 |  |
Proceeds from issuance and preferred stock |  |  | $ 11,200 |  |
Net proceeds from issuance of stock |  |  | $ 10,200 |  |
Redemption of preferred stock (in shares) | shares |  |  | 600 |  |
Redemption price of preferred stock (in dollars per share) | $ / shares |  |  | $ 22.5 |  |
Redemption of preferred stock |  |  | $ 14 |  |
Series B Preferred Stock | Sales Commissions and Broker-Dealer Fees | Gladstone Securities | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Base management fee |  |  | 1,000 |  |
Gladstone Securities |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Payment of management fees |  |  |  | $ 2,200 |
Gladstone Securities | Series B Preferred Stock | Sales Commissions and Broker-Dealer Fees | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Payment of management fees |  |  | $ 954 |  |
Limited Partner | Gladstone Land Limited Partnership |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
OP units tendered for redemption (in shares) | shares |  |  |  | 437,226 | 441,153
Limited Partner | Gladstone Land Limited Partnership | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
OP units tendered for redemption (in shares) | shares |  |  | 168,079 |  |

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