Note 3 - Investments in Related Parties - Equity Method Investments (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Loss recorded in the Consolidated Statements of Operations				$ 51	$ (0)
HC Government Realty Trust, Inc [Member]
Ownership percentage		28.00%		28.00%		27.40%
Investment in affiliate, balance		$ 10,280		$ 10,280		$ 10,551
Loss recorded in the Consolidated Statements of Operations	[1]	$ (245)	$ 77	$ (271)	(44)
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		$ 10,250		$ 10,250		$ 10,250
Loss recorded in the Consolidated Statements of Operations	[1]	$ 0	0	$ 0	0
HC Government Realty Trust, Inc [Member] | Common Stock of Investee [Member]
Ownership percentage		0.10%		0.10%		1.10%
Investment in affiliate, balance		$ 30		$ 30		$ 301
Loss recorded in the Consolidated Statements of Operations	[1]	$ (245)	$ 77	$ (271)	$ (44)

[1] Loss from these investments is included in “Net income (loss) from investments in related parties” 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.