Note D - Acquisitions and Dispositions of Investments in Real Estate - Parking Asset Acquisitions (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($) ft² a	Dec. 31, 2021 USD ($) ft² a
Two22 Sheridan Bricktown Garage [Member]
Number of space	555
Property size (Acre) | a	0.64
Retail size (Square Foot) | ft²	15,628
Purchase price	$ 17,513,000
One W7 Carpark LLC [Member]
Number of space		765
Property size (Acre) | a		1.21
Retail size (Square Foot) | ft²		18,385
Purchase price		$ 32,122,000
Two2 W7 [Member]
Number of space		1,625
Property size (Acre) | a		1.84
Purchase price		$ 28,314,000
Three22 Streeter [Member]
Number of space		1,154
Property size (Acre) | a		2.81
Purchase price		$ 38,483,000
Second Street [Member]
Number of space		118
Purchase price		$ 3,253,000
Denver 1725 Champa Street Garage, LLC [Member]
Number of space		450
Property size (Acre) | a		0.72
Purchase price		$ 16,274,000