Investments, Mortgage Loans, Investment Real Estate, Notes Receivable, and Short-Term Investments (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Cost Method Investments [Abstract]
Equity Securities without Readily Determinable Fair Value, Amount	$ 14,389,189		$ 14,389,189	[1]
Mortgage Loans [Abstract]
Mortgage loans acquired, including discounted mortgage loans	$ 387,039		931,378
Servicing fee on loan	0.25%
Loan origination	0.50%
Loan limit threshold for appraised property value	80.00%
Mortgage loans reserve	$ 0		0
Mortgage loan holdings [Abstract]
In good standing	17,901,426		18,704,351
Overdue interest over 90 days	2,080,773		2,098,014
Total mortgage loans	19,982,199		20,802,365	[1]
Investment Real Estate [Abstract]
Impairment on investment real estate	0
Total investment real estate	$ 37,807,570		$ 38,086,391	[1]
Oil & Gas Royalties - as a % of total Inv RE	46.00%		48.00%
RE Acquired	$ 780,781	$ 0
Notes Receivable [Abstract]
Valuation allowance	0		$ 0
Notes receivable acquired	0	3,500,000
Short-Term Investments [Abstract]
Short-term investments acquired	0	$ 7,890,228
Raw Land [Member]
Investment Real Estate [Abstract]
Total investment real estate	12,081,126		11,727,103
Commercial [Member]
Investment Real Estate [Abstract]
Total investment real estate	3,504,783		3,530,064
Residential [Member]
Investment Real Estate [Abstract]
Total investment real estate	3,031,144		2,797,648
Land, Minerals and Royalty Interests [Member]
Investment Real Estate [Abstract]
Total investment real estate	$ 19,190,517		$ 20,031,576
Minimum [Member]
Investment Real Estate [Abstract]
Estimated useful life	3 years
Maximum [Member]
Investment Real Estate [Abstract]
Estimated useful life	30 years
Farm Loans [Member] | Minimum [Member]
Mortgage Loans [Abstract]
Interest rate on mortgage loans	4.50%		4.50%
Farm Loans [Member] | Maximum [Member]
Mortgage Loans [Abstract]
Interest rate on mortgage loans	4.50%		4.50%
Commercial Loans [Member] | Minimum [Member]
Mortgage Loans [Abstract]
Interest rate on mortgage loans	4.10%		4.24%
Commercial Loans [Member] | Maximum [Member]
Mortgage Loans [Abstract]
Interest rate on mortgage loans	5.25%		5.25%
Residential Loans [Member] | Minimum [Member]
Mortgage Loans [Abstract]
Interest rate on mortgage loans	4.95%		4.95%
Residential Loans [Member] | Maximum [Member]
Mortgage Loans [Abstract]
Interest rate on mortgage loans	4.95%		4.95%

[1] Balance sheet audited at December 31, 2019.