Mortgage Notes, Lines of Credit and Bonds Payable (Details)									9 Months Ended
	Oct. 23, 2017 USD ($)	Sep. 05, 2017 USD ($)	Feb. 03, 2017 USD ($)	Dec. 22, 2015 USD ($)	Aug. 18, 2015 USD ($)	Mar. 01, 2015	Jan. 14, 2015 USD ($)	Dec. 05, 2013 USD ($)	Sep. 30, 2017 USD ($) agreement	Sep. 30, 2016 USD ($)	Mar. 29, 2017	Feb. 14, 2017 USD ($)	Jan. 12, 2017 subsidiary	Dec. 31, 2016 USD ($)	Sep. 29, 2016	Aug. 31, 2016 USD ($)	Jun. 29, 2016 USD ($) subsidiary	Jun. 28, 2016	Mar. 29, 2016 USD ($) subsidiary	Feb. 29, 2016 USD ($) subsidiary	Aug. 03, 2015 USD ($)
Mortgage notes payable
Total mortgage notes and bonds payable, net									$ 464,494,000					$ 308,779,000
Debt issuance costs, net									(1,360,000)					(1,193,000)
Unamortized premium									20,000					110,000
Principal outstanding									465,834,000					309,862,000
Book Value of Collateral									917,401,000
Available borrowing capacity									3,100,000
Debt									465,800,000
Remaining borrowing capacity									0
Debt repayment									20,819,000	$ 84,750,000
Payment of debt issuance costs									817,000	937,000
Accrued interest									2,886,000					1,538,000
Cash paid during period for interest									8,491,000	6,706,000
Accumulated amortization of deferred financing fees									500,000	700,000
Aggregate maturities of long-term debt
2017 (remaining three months)									60,400,000
2019									6,481,000
2020									48,300,000
Thereafter									350,653,000
Total									$ 465,834,000
Farmer Mac Facility | Secured notes
Mortgage notes payable
Maximum aggregate principal amount																					$ 165,000,000
Effective loan-to-value ratios as a percentage of the appraised value of agricultural real estate securing such mortgage loans									60.00%
Outstanding debt									$ 134,800,000					155,500,000
Farmer Mac Facility | Secured notes | Minimum
Mortgage notes payable
Leverage ratio (as a percent)									60.00%
Fixed charge coverage ratio									1.50
Collateral value as percentage of aggregate principal amount of outstanding notes (as a percent)						100.00%
Total collateral value as percentage of aggregate principal amount of outstanding notes (as a percent)						110.00%
Bridge Loan Agreement
Mortgage notes payable
Number of subsidiaries | subsidiary																				2
Loan																				$ 53,000,000
Payment of debt issuance costs										173,907
Cash paid during period for interest										2,271,867
Additional interest paid										$ 2,120,000
Additional interest, percentage										4.00%
MetLife
Mortgage notes payable
Interest rate (as a percent)											3.48%
Number of subsidiaries | subsidiary																	5		5
Payment of debt issuance costs									$ 800,000
MetLife | Term Loan
Mortgage notes payable
Principal amount of loan																			$ 127,000,000
Maximum loan to value ratio									60.00%
MetLife | Term Loan One
Mortgage notes payable
Interest rate (as a percent)																		2.40%
Interest Rate (as a percent)									2.00%
Principal amount of loan																			90,000,000
MetLife | Term Loan Two
Mortgage notes payable
Principal amount of loan																			16,000,000
MetLife | Term Loan Three
Mortgage notes payable
Principal amount of loan																			$ 21,000,000
MetLife | Term Loan Two and Three
Mortgage notes payable
Interest rate (as a percent)									2.66%
Minimum prepayment premium									20.00%
Percentage of conditional prepayment of loan without penalty									1.00%
MetLife | Term Loan Four
Mortgage notes payable
Interest rate (as a percent)																	2.39%
Rutledge Credit Facilities | Secured notes
Mortgage notes payable
Non usage fee (as a percent)				0.25%	0.25%		0.25%	0.25%
Maximum aggregate principal amount				$ 15,000,000	$ 25,000,000		$ 25,000,000	$ 25,000,000
Number of loan agreements | agreement									4
Period of calculation of non usage fee				3 months	3 months		3 months	3 months
Percentage of aggregate loan value that may not exceed the appraised value of collateralized properties			50.00%
Fifth Rutledge Loan Agreement | Secured notes
Mortgage notes payable
Margin added to reference rate (as a percent)			1.30%
Non usage fee (as a percent)			0.25%
Maximum aggregate principal amount			$ 30.0
Period of calculation of non usage fee			3 months
Fifth Rutledge Loan Agreement | Secured notes | Maximum
Mortgage notes payable
Percentage to maintain leverage ratio			60.00%
3 month LIBOR | MetLife | Term Loan One
Mortgage notes payable
Margin added to reference rate (as a percent)									1.75%
3 month LIBOR | Rutledge Credit Facilities | Secured notes
Mortgage notes payable
Margin added to reference rate (as a percent)				1.30%	1.30%		1.30%	1.30%
Mortgage notes payable | Fair value | Level 3
Aggregate maturities of long-term debt
Debt									$ 458,900,000					300,100,000
Farmer Mac Bond #1
Mortgage notes payable
Principal outstanding														20,700,000
Interest rate (as a percent)									2.40%
Interest Rate (as a percent)									2.40%
Debt repayment		$ 20,700,000
Farmer Mac Bond #2
Mortgage notes payable
Principal outstanding									$ 5,460,000					5,460,000
Interest rate (as a percent)									2.35%
Interest Rate (as a percent)									2.35%
Book Value of Collateral									$ 9,557,000
Debt repayment	$ 5,500,000
Farmer Mac Bond #3
Mortgage notes payable
Principal outstanding									$ 10,680,000					10,680,000
Interest rate (as a percent)									2.50%
Interest Rate (as a percent)									2.50%
Book Value of Collateral									$ 11,487,000
Farmer Mac Bond #4
Mortgage notes payable
Principal outstanding									$ 13,400,000					13,400,000
Interest rate (as a percent)									2.50%
Interest Rate (as a percent)									2.50%
Book Value of Collateral									$ 23,588,000
Farmer Mac Bond #5
Mortgage notes payable
Principal outstanding									$ 30,860,000					30,860,000
Interest rate (as a percent)									2.56%
Interest Rate (as a percent)									2.56%
Book Value of Collateral									$ 61,104,000
Farmer Mac Bond #6
Mortgage notes payable
Principal outstanding									$ 14,915,000					14,915,000
Interest rate (as a percent)									3.69%
Interest Rate (as a percent)									3.69%
Book Value of Collateral									$ 21,609,000
Farmer Mac Bond #7
Mortgage notes payable
Principal outstanding									$ 11,160,000					11,160,000
Interest rate (as a percent)									3.68%
Interest Rate (as a percent)									3.68%
Book Value of Collateral									$ 18,441,000
Farmer Mac Bond #8A
Mortgage notes payable
Principal outstanding									$ 41,700,000					41,700,000
Interest rate (as a percent)									3.20%
Interest Rate (as a percent)									3.20%
Book Value of Collateral									$ 80,929,000
Farmer Mac Bond #9
Mortgage notes payable
Principal outstanding									$ 6,600,000					6,600,000
Interest rate (as a percent)									3.35%
Interest Rate (as a percent)									3.35%
Book Value of Collateral									$ 7,711,000
MetLife Term Loan #1
Mortgage notes payable
Principal outstanding									$ 90,000,000					90,000,000
Interest rate (as a percent)									3.48%
Adjustment term for the interest rate on the debt instrument									3 years
Interest Rate (as a percent)									3.48%
Book Value of Collateral									$ 198,345,000
MetLife Term Loan #1 | Term Loan Four
Mortgage notes payable
Interest rate (as a percent)															2.60%
MetLife Term Loan #1 | LIBOR
Mortgage notes payable
Margin added to reference rate (as a percent)									3.48%
MetLife Term Loan #2
Mortgage notes payable
Principal outstanding									$ 16,000,000					16,000,000
Interest rate (as a percent)									2.66%
Adjustment term for the interest rate on the debt instrument									3 years
Interest Rate (as a percent)									2.66%
Book Value of Collateral									$ 31,677,000
MetLife Term Loan #2 | LIBOR
Mortgage notes payable
Margin added to reference rate (as a percent)									2.66%
MetLife Term Loan #3
Mortgage notes payable
Principal outstanding									$ 21,000,000					21,000,000
Interest rate (as a percent)									2.66%
Adjustment term for the interest rate on the debt instrument									3 years
Interest Rate (as a percent)									2.66%
Book Value of Collateral									$ 27,654,000
MetLife Term Loan #4
Mortgage notes payable
Principal outstanding									$ 15,685,000					15,685,000			$ 15,700,000
Interest rate (as a percent)									3.48%
Adjustment term for the interest rate on the debt instrument									3 years
Margin added to reference rate (as a percent)									3.48%
Interest Rate (as a percent)									3.48%
Book Value of Collateral									$ 30,624,000
MetLife Term Loan #4 | Minimum
Mortgage notes payable
Interest rate (as a percent)									2.00%
MetLife Term Loan #4 | Term Loan Four
Mortgage notes payable
Interest rate (as a percent)															2.60%
MetLife Term Loan #4 | 3 month LIBOR | Minimum
Mortgage notes payable
Margin added to reference rate (as a percent)									1.75%
MetLife Term Loan #5
Mortgage notes payable
Principal outstanding									$ 8,379,000
Interest rate (as a percent)									3.26%
Adjustment term for the interest rate on the debt instrument									3 years
Interest Rate (as a percent)									3.26%
Book Value of Collateral									$ 16,761,000
Number of subsidiaries | subsidiary													5
MetLife Term Loan #5 | Term Loan Five
Mortgage notes payable
Interest rate (as a percent)													3.26%
MetLife Term Loan #6
Mortgage notes payable
Principal outstanding									$ 27,159,000			$ 27,200,000
Interest rate (as a percent)									3.21%
Adjustment term for the interest rate on the debt instrument									3 years
Interest Rate (as a percent)									3.21%
Book Value of Collateral									$ 55,526,000
MetLife Term Loan #6 | Term Loan Six
Mortgage notes payable
Interest rate (as a percent)												3.21%
MetLife Term Loan #7
Mortgage notes payable
Principal outstanding									$ 21,253,000
Interest rate (as a percent)									3.45%
Adjustment term for the interest rate on the debt instrument									3 years
Interest Rate (as a percent)									3.45%
Book Value of Collateral									$ 48,307,000
Farm Credit of Central Florida
Mortgage notes payable
Principal outstanding									$ 5,102,000					5,102,000		$ 8,200,000
Interest rate (as a percent)									2.6875%
Interest Rate (as a percent)									3.92%
Book Value of Collateral									$ 9,688,000
Coverage Ratio									1.25
Farm Credit of Central Florida | LIBOR
Mortgage notes payable
Interest rate (as a percent)									2.6875%
Prudential
Mortgage notes payable
Principal outstanding									$ 6,481,000					$ 6,600,000
Interest rate (as a percent)									3.20%
Interest Rate (as a percent)									3.20%
Book Value of Collateral									$ 11,643,000
Prudential | Maximum
Mortgage notes payable
Leverage ratio (as a percent)									60.00%
Rutledge Note Payable#1
Mortgage notes payable
Principal outstanding									$ 25,000,000
Interest Rate (as a percent)									2.60%
Book Value of Collateral									$ 46,022,000
Rutledge Note Payable#1 | 3 month LIBOR
Mortgage notes payable
Margin added to reference rate (as a percent)									1.30%
Rutledge Note Payable#2
Mortgage notes payable
Principal outstanding									$ 25,000,000
Interest Rate (as a percent)									2.60%
Book Value of Collateral									$ 49,700,000
Rutledge Note Payable#2 | 3 month LIBOR
Mortgage notes payable
Margin added to reference rate (as a percent)									1.30%
Rutledge Note Payable#3
Mortgage notes payable
Principal outstanding									$ 25,000,000
Interest Rate (as a percent)									2.60%
Book Value of Collateral									$ 58,985,000
Rutledge Note Payable#3 | 3 month LIBOR
Mortgage notes payable
Margin added to reference rate (as a percent)									1.30%
Rutledge Note Payable#4
Mortgage notes payable
Principal outstanding									$ 15,000,000
Interest Rate (as a percent)									2.60%
Book Value of Collateral									$ 28,271,000
Rutledge Note Payable#4 | 3 month LIBOR
Mortgage notes payable
Margin added to reference rate (as a percent)									1.30%
Rutledge Note Payable#5
Mortgage notes payable
Principal outstanding									$ 30,000,000
Interest Rate (as a percent)									2.60%
Book Value of Collateral									$ 69,772,000
Rutledge Note Payable#5 | 3 month LIBOR
Mortgage notes payable
Margin added to reference rate (as a percent)									1.30%