Note 12 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Capital expenditures and tenant improvements	$ 597,873	$ 319,737
Acquisition of operating properties	5,039,455	2,427,890
Total real estate investments	5,637,328	2,747,627
Office/Industrial Properties [Member]
Capital expenditures and tenant improvements	597,873	319,737
Acquisition of operating properties	5,039,455	2,427,890
Model Home [Member]
Acquisition of operating properties	0	0
Retail Properties [Member]
Capital expenditures and tenant improvements	0	0
Acquisition of operating properties	$ 5,039,455	$ 2,427,890