Loans Payable - Interest expense (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Mortgage Interest Expense	$ 804,872	$ 776,666	$ 2,157,242	$ 2,294,407
Amortization of discounts and capitalized issuance costs	83,301	71,760	245,945	1,950,814
Other interest expense	101,082	102,344	301,648	363,977
Total interest expense	989,255	950,770	2,704,835	4,609,198
Amortization and preferred stock dividends on mandatorily redeemable preferred stock
Debt Instrument [Line Items]
Amortization of discounts and capitalized issuance costs	56,311	51,637	165,338	151,616
Other interest expense	100,000	100,000	300,000	300,000
Total interest expense	156,311	151,637	465,338	451,616
Amortization and interest on convertible debentures
Debt Instrument [Line Items]
Amortization of discounts and capitalized issuance costs				1,718,487
Other interest expense				42,486
Total interest expense				1,760,973
Other interest
Debt Instrument [Line Items]
Other interest expense		332		5,100
Total interest expense		332		5,100
Franklin Square Property
Debt Instrument [Line Items]
Mortgage Interest Expense	128,943	171,458	382,625	508,783
Amortization of discounts and capitalized issuance costs	7,093	2,317	21,279	6,961
Total interest expense	136,036	173,775	403,904	515,744
Hanover Square Property
Debt Instrument [Line Items]
Mortgage Interest Expense	108,222	108,571	319,640	328,636
Amortization of discounts and capitalized issuance costs	3,223	3,223	9,668	9,680
Total interest expense	111,445	111,794	329,308	338,316
Hampton Inn Property
Debt Instrument [Line Items]
Mortgage Interest Expense		116,422		456,300
Amortization of discounts and capitalized issuance costs				9,000
Other interest expense		1,655		10,544
Total interest expense		118,077		475,844
Ashley Plaza Property
Debt Instrument [Line Items]
Mortgage Interest Expense	105,438	107,459	314,378	320,316
Amortization of discounts and capitalized issuance costs	4,357	4,358	13,072	13,074
Total interest expense	109,795	111,817	327,450	333,390
Clemson Best Western Property
Debt Instrument [Line Items]
Mortgage Interest Expense	146,507	141,609	425,109	420,211
Amortization of discounts and capitalized issuance costs				22,437
Other interest expense	1,082	357	1,648	5,847
Total interest expense	147,589	141,966	426,757	448,495
Brookfield Center Property.
Debt Instrument [Line Items]
Mortgage Interest Expense	46,844	47,708	139,646	142,188
Amortization of discounts and capitalized issuance costs	2,838	2,838	8,513	8,514
Total interest expense	49,682	50,546	148,159	150,702
Lancer Centers Property
Debt Instrument [Line Items]
Mortgage Interest Expense		65,959	115,179	100,493
Amortization of discounts and capitalized issuance costs		7,156	11,928	10,814
Total interest expense		$ 73,115	127,107	111,307
Greenbrier Business Center Property
Debt Instrument [Line Items]
Mortgage Interest Expense			81,409	17,480
Amortization of discounts and capitalized issuance costs			1,155	231
Total interest expense			82,564	$ 17,711
Parkway Center
Debt Instrument [Line Items]
Mortgage Interest Expense	56,023		124,490
Amortization of discounts and capitalized issuance costs	2,757		8,270
Total interest expense	58,780		132,760
Wells Fargo Facility
Debt Instrument [Line Items]
Mortgage Interest Expense	212,895		254,766
Amortization of discounts and capitalized issuance costs	6,722		6,722
Total interest expense	$ 219,617		$ 261,488