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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Debt, Current $ 93,100    
Long-Term Line of Credit 58,579   $ 58,523
Notes Payable $ 132,920   $ 134,380
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Parking Facilities, Operator, SP+Corporation [Member]      
Concentration Risk, Percentage 56.90% 61.00%  
Real Estate Owned [Member] | Geographic Concentration Risk [Member] | Cincinnati [Member]      
Concentration Risk, Percentage 18.70%   19.40%
Real Estate Owned [Member] | Geographic Concentration Risk [Member] | Detroit [Member]      
Concentration Risk, Percentage 10.40%   10.30%
Real Estate Owned [Member] | Geographic Concentration Risk [Member] | Chicago [Member]      
Concentration Risk, Percentage 9.20%   9.10%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Parking Facilities, Operator, SP+Corporation [Member]      
Concentration Risk, Percentage 32.20%   60.10%
Notes Payable, Other Payables [Member]      
Notes Payable $ 34,400    
Revolving Credit Facility [Member]      
Long-Term Line of Credit $ 58,700