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v3.10.0.1

Subsequent Events - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 01, 2018 USD ($) a option | Nov. 08, 2018 USD ($) shares | Oct. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) a | Sep. 30, 2017 USD ($) a | Sep. 30, 2018 USD ($) a | Sep. 30, 2017 USD ($) a | Oct. 09, 2018 $ / shares
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a |  |  |  | 67,826 | 61,794 | 67,826 | 61,794 |
Rental revenue |  |  |  | $ 8,013,000 | $ 6,561,000 | $ 21,333,000 | $ 18,302,000 |
Financing fee |  |  |  | 57,000 | 28,000 | 59,000 | 30,000 |
Base management fee |  |  |  | 690,000 | $ 523,000 | 2,102,000 | $ 1,446,000 |
Subsequent event | Farm Credit West Note Payable due 2043 |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Proceeds from notes payable | $ 13,800,000 |  |  |  |  |  |  |
Interest rate (as percent) | 5.61% |  |  |  |  |  |  |
Series B Preferred Stock | Subsequent event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Sale of stock sold under sale agreement (in shares) | shares |  | 199,353 |  |  |  |  |  |
Proceeds from issuance of preferred stock |  | $ 5,000,000 |  |  |  |  |  |
Net proceeds from issuance of stock |  | 4,500,000 |  |  |  |  |  |
Distributions per share | $ / shares |  |  |  |  |  |  |  | $ 0.375
Common Stock | Subsequent event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distributions per share | $ / shares |  |  |  |  |  |  |  | $ 0.1332
Gladstone Securities |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Payment of management fees |  |  |  | 843,000 |  | 890,000 |  |
Debt Financing Costs | Gladstone Securities | Subsequent event | Farm Credit West Note Payable due 2043 |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Financing fee | $ 17,000 |  |  |  |  |  |  |
Sales Commissions and Broker-Dealer Fees | Gladstone Securities | Series B Preferred Stock | Subsequent event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Payment of management fees |  | 459,000 |  |  |  |  |  |
Sales Commissions and Broker-Dealer Fees | Gladstone Securities | Series B Preferred Stock | Subsequent event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Base management fee |  | $ 484,000 |  |  |  |  |  |
Sunnyside Avenue, 951-acre farm in Madera County, California | Subsequent event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a | 951 |  |  |  |  |  |  |
Purchase price | $ 23,000,000 |  |  |  |  |  |  |
Lease term (in years) | 8 years |  |  |  |  |  |  |
Number of renewal options | option | 2 |  |  |  |  |  |  |
Renewal term | 5 years |  |  |  |  |  |  |
Annualized straight-line rent | $ 1,200,000 |  |  |  |  |  |  |
119-acre farm in Van Buren County, Michigan |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Rental revenue |  |  |  | 28,000 |  | 85,000 |  |
Accretion of tenant-funded improvements |  |  |  | $ 7,000 |  | $ 20,000 |  |
61-acre farm in Hillsborough County, Florida | Subsequent event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Annualized straight-line rent |  |  | $ 15,000 |  |  |  |  |
Annualized straight-line rent, increase (decrease) |  |  | $ 56,000 |  |  |  |  |
Annualized straight-line rent, increase (decrease), percentage |  |  | 78.80% |  |  |  |  |

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