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Note 3 - Investments in Related Parties (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Related Party [Member]          
Investments $ 306,000   $ 306,000   $ 283,000
Equity Securities, FV-NI, Gain (Loss) 75,000 $ 46,000 275,000    
Related Party [Member] | Accounts Receivable [Member]          
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval 12,000   12,000   27,000
Related Party [Member] | Accounts Payable [Member]          
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval 37,000   37,000   $ 73,000
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member]          
Equity Method Investment, Aggregate Cost $ 10,250,000   $ 10,250,000    
Preferred Stock, Convertible, Conversion Price (in dollars per share) $ 10   $ 10    
Convertible Preferred Stock, Maximum Conversion Price (in dollars per share) $ 9.1   $ 9.1    
HC Government Realty Trust, Inc [Member] | Common Stock of Investee [Member]          
Equity Method Investment, Other-than-Temporary Impairment $ 0   $ 241,000 $ 0