Note 3 - Investments in Related Parties - Equity Method Investments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Loss recorded in the Consolidated Statements of Operations		$ 363	$ 280
HC Government Realty Trust, Inc [Member]
Equity Method Investment, Ownership Percentage		28.00%	27.40%
Investment in affiliate, balance		$ 9,265	$ 10,551
Loss recorded in the Consolidated Statements of Operations	[1]	$ (1,286)	$ (213)
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member]
Equity Method Investment, Ownership Percentage	[2]	27.90%	26.30%
Investment in affiliate, balance	[2]	$ 9,256	$ 10,250
Loss recorded in the Consolidated Statements of Operations	[1],[2]	$ (994)	$ 0
HC Government Realty Trust, Inc [Member] | Common Stock [Member]
Equity Method Investment, Ownership Percentage		0.10%	1.10%
Investment in affiliate, balance		$ 9	$ 301
Loss recorded in the Consolidated Statements of Operations	[1]	$ (292)	$ (213)

[1] Loss from these investments is included in “Loss from investments in related parties, net” in the Consolidated Statements of Operations. Since HC Realty is a REIT and not a taxable entity, the loss is not reported net of taxes.

[2] Represents investments in shares of HC Series B Stock with an original basis of $10.25 million. Each share of HC Series B Stock has voting rights on an as converted basis and can be converted into shares of HC Common Stock at a conversion ratio equal to $10.00 per share divided by the lesser of $9.10 per share or the fair market value per share of HC Common Stock, subject to adjustment upon the occurrence of certain events.