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Stockholders' Equity and Non-controlling Interests - Redeemable non-controlling interest (Details) - USD ($)																		1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Nov. 07, 2019	Oct. 15, 2019	Aug. 06, 2019	Jul. 15, 2019	May 08, 2019	Apr. 15, 2019	Feb. 07, 2019	Jan. 15, 2019	Nov. 05, 2018	Oct. 15, 2018	Aug. 08, 2018	Jul. 16, 2018	May 01, 2018	Apr. 16, 2018	Feb. 13, 2018	Aug. 17, 2017	Mar. 02, 2016	Aug. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Aug. 06, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Aug. 10, 2017
Change in redeemable non-controlling interest
Opening balance																						$ 120,510,000
Ending balance																			$ 119,633,000			119,633,000		$ 120,510,000
Series B Participating Preferred Stock																			$ 142,861,000			$ 142,861,000		$ 143,758,000
Dividend paid (in dollars per share)		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.1275		$ 0.1275
Dividends declared per common share			$ 0.0500		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.1275		$ 0.1275				$ 0.05	$ 0.0500	$ 0.1500	$ 0.1000	$ 0.3100	$ 0.3550
Repayment of principal																						$ 11,342,000	$ 11,466,000
Distributions payable																						$ 95,000	229,000
Redeemable Preferred OP Units
Change in redeemable non-controlling interest
Percentage of cumulative preferential dividends																						3.00%
Redeemable Preferred OP Units \| Preferred stock
Change in redeemable non-controlling interest
Opening balance																						$ 120,510,000	$ 120,510,000	$ 120,510,000
Opening balance (in shares)																						117,000	117,000	117,000
Distributions paid to non-controlling interest																						$ (3,510,000)	$ (3,510,000)
Accrued distributions to non-controlling interest																						2,633,000	2,633,000
Ending balance																			$ 119,633,000	$ 119,633,000		$ 119,633,000	$ 119,633,000	$ 120,510,000
Ending balance (in shares)																			117,000	117,000		117,000	117,000	117,000
Series A Preferred Units
Change in redeemable non-controlling interest
Percentage of preferential cash distribution																	3.00%
Liquidation preference																	$ 1,000
Number of trading days																						20 days
Series A Preferred Units \| Asset acquisition
Change in redeemable non-controlling interest
Liquidation value																			$ 119,600,000			$ 119,600,000		$ 120,500,000
Series A Preferred Units \| Asset acquisition \| Illinois
Stockholders’ Equity and Non-controlling Interests
Issuance of Common units as partial consideration for asset acquisition (in shares)																	117,000
Series B Participating Preferred Stock
Change in redeemable non-controlling interest
Percentage of cumulative change in the estimated value of farmland																50.00%
Final liquidation preference, percentage cap on total return																9.00%
Number of preceding years considered in redemption price calculation																						4 years
Constant percentage																						50.00%
USDA FVA annual adjustment amount per share of Series B Participating Preferred Stock																		$ 0.69
Shares issued under underwriting agreement																6,037,500									6,037,500
Preference dividend (as a percent)																6.00%
Par value																$ 0.01
Common stock, issue price (in dollars per share)																25.00
Liquidation preference																$ 25
Distributions paid																						$ 2,200,000
Series B Participating Preferred Stock \| Subsequent event
Change in redeemable non-controlling interest
Preference dividend (as a percent)	6.00%
Series B Participating Preferred Stock \| Maximum \| Subsequent event
Change in redeemable non-controlling interest
Increase in stock repurchase plan	$ 51,863,817.13