Note 3 - Investments in Related Parties (Details Textual)					1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 29, 2020 shares	Apr. 09, 2020 shares	Apr. 03, 2020 shares	Mar. 19, 2019 USD ($) shares	Jun. 30, 2024 shares	Jun. 29, 2020 USD ($)	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) shares
Related Party [Member]
Equity Securities without Readily Determinable Fair Value, Amount							$ 808,000	$ 283,000
Accounts Receivable, after Allowance for Credit Loss							3,000	27,000
Accounts Payable							136,000	73,000
Equity Securities, FV-NI, Gain (Loss)							$ 465,000	$ 81,000
Common Stock [Member] | HC Government Realty Trust, Inc [Member] | Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio					1,200
HC Government Realty Trust, Inc [Member]
Equity Method Investment, Ownership Percentage							28.00%	27.40%
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member]
Equity Method Investment, Shares Purchased During Period (in shares) | shares	475,000	250,000	100,000	200,000
Preferred Stock, Dividend Rate, Percentage				10.00%
Equity Method Investment, Aggregate Cost				$ 2,000,000			$ 10,250,000
Payments to Acquire Equity Method Investments						$ 8,250,000
Investment Owned, Balance, Shares (in shares) | shares							1,025,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares							$ 10
Convertible Preferred Stock, Maximum Conversion Price (in dollars per share) | $ / shares							$ 9.1
Equity Method Investment, Other-than-Temporary Impairment							$ 994,000	$ 0
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member] | Investors Affiliated with the Hale Partnership [Member]
Equity Method Investment, Shares Purchased During Period (in shares) | shares				850,000
Equity Method Investment, Aggregate Cost				$ 8,500,000
HC Government Realty Trust, Inc [Member] | Common Stock of Investee [Member]
Equity Method Investment, Shares Purchased During Period (in shares) | shares				300,000
Equity Method Investment, Aggregate Cost				$ 3,000,000
HC Government Realty Trust, Inc [Member] | Common Stock [Member]
Investment Owned, Balance, Shares (in shares) | shares					250		250	300,000
Equity Method Investment, Ownership Percentage							28.00%
Equity Method Investment, Other-than-Temporary Impairment							$ 260,000	$ 0