Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details)

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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Base management fee $ 690 $ 523 $ 2,102 $ 1,446  
Incentive fee 0 261 0 688  
Capital gains fee 778 0 778 0  
Credits to fees from Adviser (796) (54) (970) (54)  
Total fees to our Adviser 672 730 1,910 2,080  
Administration fee 387 211 935 656  
Financing fee 57 28 59 30  
Total fees to Gladstone Securities 947 28 999 30  
Administration fee 340   340   $ 258
Crop inventory 0   0   $ 1,528
Taxable REIT Subsidiary          
Related Party Transaction [Line Items]          
Base management fee 94   176    
Administration fee 18   48    
Allocation of overhead costs 3   31    
Administration fee 18   18    
Preferred Stock | Series B Preferred Stock          
Related Party Transaction [Line Items]          
Base management fee 890 $ 0 940 $ 0  
Gladstone Securities          
Related Party Transaction [Line Items]          
Administration fee     57    
Gladstone Securities          
Related Party Transaction [Line Items]          
Payment of management fees $ 843   $ 890