Note 3 - Investments in Related Parties - Equity Method Investments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024		Sep. 30, 2023		Dec. 31, 2023
Loss recorded in the Consolidated Statements of Operations				$ 273		$ 214
HC Government Realty Trust, Inc [Member]
Ownership percentage		28.00%		28.00%				27.40%
Investment in affiliate, balance		$ 10,278		$ 10,278				$ 10,551
Loss recorded in the Consolidated Statements of Operations		$ (2)	$ (145)	$ (273)	[1]	(189)	[1]
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member]
Ownership percentage	[2]	27.90%		27.90%				26.30%
Investment in affiliate, balance	[2]	$ 10,250		$ 10,250				$ 10,250
Loss recorded in the Consolidated Statements of Operations	[2]	$ 0	0	$ 0	[1]	0	[1]
HC Government Realty Trust, Inc [Member] | Common Stock of Investee [Member]
Ownership percentage		0.10%		0.10%				1.10%
Investment in affiliate, balance		$ 28		$ 28				$ 301
Loss recorded in the Consolidated Statements of Operations		$ (2)	$ (145)	$ (273)	[1]	$ (189)	[1]

[1] Loss from these investments is included in “Income (loss) from investments in related parties, net” in the Unaudited 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 a 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.