Note L - Variable Interest Entities (Details Textual) ft² in Millions	6 Months Ended
	Jun. 30, 2022 USD ($) ft² a	Dec. 31, 2021 USD ($)	Aug. 25, 2021 USD ($)
Area of Real Estate Property (Square Foot) | ft²	5.5
Number of Parking Spaces	15,818
Assets, Total	$ 439,661,000	$ 429,147,000
Liabilities, Total	$ 243,221,000	$ 223,323,000
Cardinal Lot [Member]
Area of Real Estate Property (Square Foot) | a	2.56
Number of Parking Spaces	376
MVP St. Louise [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	51.00%
Assets, Total			$ 12,000,000.0
Liabilities, Total			$ 6,200,000
Gain (Loss) on Consolidation of VIE	$ 360,000