Organization and Significant Accounting Policies (Details)				3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Nov. 08, 2017	Aug. 17, 2017 $ / shares shares	Feb. 02, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) a $ / shares	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2017 USD ($) a lease $ / shares	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) $ / shares	Aug. 10, 2017 shares
Organization and Significant Accounting Policies
Area of real estate property | a				154,164				154,164
Common stock, par value (in dollars per share) | $ / shares				$ 0.01				$ 0.01		$ 0.01
Tenant reimbursements				$ 474,000		$ 112,000		$ 1,230,000	$ 276,000
Rental revenue				11,107,000		6,164,000		28,381,000	16,462,000
Retained earnings				2,665,000				2,665,000		$ 4,103,000
Accounts receivable, net				3,205,000				$ 3,205,000		4,181,000
Number of operating leases | lease								3
Below Market Lease
Below market lease						29,000			29,000
Below market lease, accumulated amortization						100,000			100,000
Above market leases								$ 0		$ 0
Tenant relationship intangibles				900,000		0		900,000	0
Tenant relationship intangibles, accumulated amortization				500,000		$ 0		500,000	$ 0
Adjustment
Organization and Significant Accounting Policies
Tenant reimbursements					$ 200,000		$ 200,000
Rental revenue				200,000
Deferred revenue				(200,000)				$ (200,000)
Term less than 12 months
Organization and Significant Accounting Policies
Number of operating leases | lease								2
American Farmland Company
Organization and Significant Accounting Policies
Common stock, par value (in dollars per share) | $ / shares			$ 0.01
Consideration share price | $ / shares			$ 11.41
Units issued | shares			14,763,604
Consideration amount			$ 171,100,000
Acquired debt				$ 75,000,000				$ 75,000,000
American Farmland Company | Restricted stock units
Organization and Significant Accounting Policies
Units issued | shares			17,373
American Farmland Company | Common units
Organization and Significant Accounting Policies
Consideration share price | $ / shares			$ 0.7417
Units issued | shares			218,525
TRS
Organization and Significant Accounting Policies
Area of real estate property | a				716				716
Operating Partnership
Organization and Significant Accounting Policies
Ownership interest (as a percent)				85.10%				85.10%		75.10%
Series B Participating Preferred Stock
Organization and Significant Accounting Policies
Shares issued under underwriting agreement | shares		6,037,500									6,037,500
Preference dividend (as a percent)		6.00%
Par value | $ / shares		$ 0.01
Series B Participating Preferred Stock | Subsequent event
Organization and Significant Accounting Policies
Preference dividend (as a percent)	6.00%