Investments, Mortgage Loans, Investment Real Estate, and Notes Receivable (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) Loan	Dec. 31, 2017 USD ($) Loan
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans acquired, including discounted mortgage loans	$ 0	$ 360,531
Servicing fee on loan	0.25%
Loan origination	0.50%
Loan limit threshold for appraised property value	80.00%
Mortgage loans reserve	$ 0	$ 0
Discounted mortgage loan portfolio payment performance [Abstract]
Number of discounted loans with no payments | Loan	8	8
Number of discounted loans one time payment received | Loan	1	1
Number of discounted loans irregular payments received | Loan	2	2
Number of discounted loans periodic payments received | Loan	5	5
Number of discounted loans | Loan	16	16
Discounted loans with no payments	$ 0	$ 0
Discounted loans with one time payment received	0	0
Discounted loans with irregular payments received	20,834	20,834
Discounted loans with periodic payments received	2,090,929	2,168,062
Discounted loans	2,111,763	2,188,896
Discounted mortgage loan holdings [Abstract]
In good standing	12,108,873	15,310,941
Overdue interest over 90 days	3,201,463	0
Restructured	0	0
In process of foreclosure	0	2,003,536
Total mortgage loans	15,310,336	17,314,477	[1]
Total foreclosed loans during the year	0	0
Notes Receivable [Abstract]
Valuation allowance	$ 0	$ 0
Farm Loans [Member] | Maximum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Interest rate on mortgage loans	5.00%	5.00%
Farm Loans [Member] | Minimum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Interest rate on mortgage loans	5.00%	5.00%
Commercial Loans [Member] | Maximum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Interest rate on mortgage loans	7.50%	7.50%
Commercial Loans [Member] | Minimum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Interest rate on mortgage loans	4.00%	4.00%
Residential Loans [Member] | Maximum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Interest rate on mortgage loans	8.00%	8.00%
Residential Loans [Member] | Minimum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Interest rate on mortgage loans	5.00%	4.00%

[1] Balance sheet audited at December 31, 2016.