Loans Payable - Interest expense (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Mortgage Interest Expense	$ 571,023	$ 727,102	$ 1,826,518	$ 2,111,686
Amortization of discounts and capitalized issuance costs	90,731	88,397	267,920	261,270
Interest rate protection transaction payments	(31,353)	(29,953)	(83,253)	(74,950)
Other interest expense	100,521	114,636	319,845	314,636
Total interest expense	730,922	900,182	2,331,030	2,612,642
Wells Fargo Line of Credit
Debt Instrument [Line Items]
Other interest expense			15,144
Total interest expense			15,144
Amortization and preferred stock dividends on mandatorily redeemable preferred stock
Debt Instrument [Line Items]
Amortization of discounts and capitalized issuance costs	66,965	61,408	196,621	180,303
Other interest expense	100,000	100,000	300,000	300,000
Total interest expense	166,965	161,408	496,621	480,303
Other interest
Debt Instrument [Line Items]
Other interest expense	521		4,701
Total interest expense	521		4,701
Franklin Square Property
Debt Instrument [Line Items]
Mortgage Interest Expense	128,943	128,943	384,026	382,625
Amortization of discounts and capitalized issuance costs	7,093	7,093	21,279	21,279
Total interest expense	136,036	136,036	405,305	403,904
Hanover Square Property
Debt Instrument [Line Items]
Mortgage Interest Expense		166,532	129,248	506,699
Amortization of discounts and capitalized issuance costs		3,223		9,668
Total interest expense		169,755	129,248	516,367
Ashley Plaza Property
Debt Instrument [Line Items]
Mortgage Interest Expense	101,170	103,339	302,936	308,208
Amortization of discounts and capitalized issuance costs	4,358	4,358	13,073	13,073
Total interest expense	105,528	107,697	316,009	321,281
Brookfield Center Property.
Debt Instrument [Line Items]
Mortgage Interest Expense	45,013	45,943	134,756	137,001
Amortization of discounts and capitalized issuance costs	2,837	2,837	8,512	8,512
Total interest expense	47,850	48,780	143,268	145,513
Parkway Center
Debt Instrument [Line Items]
Mortgage Interest Expense	92,553	74,047	266,249	155,640
Amortization of discounts and capitalized issuance costs	2,757	2,757	8,270	8,270
Interest rate protection transaction payments	(31,353)	(29,953)	(83,253)	(74,950)
Total interest expense	63,957	46,851	191,266	88,960
Wells Fargo Mortgage Facility
Debt Instrument [Line Items]
Mortgage Interest Expense	203,344	208,298	609,303	621,513
Amortization of discounts and capitalized issuance costs	6,721	6,721	20,165	20,165
Other interest expense		14,636		14,636
Total interest expense	$ 210,065	$ 229,655	$ 629,468	$ 656,314