Note 3 - Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
		Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2025
Total revenue		$ 3,816		$ 2,722
Total expense		3,260		3,171
Income tax benefit		255		(5)
Net earnings		544		(276)
Loss recorded in the Consolidated Statements of Operations		55		(62)
Net loss attributable to noncontrolling interest in operating partnership		13		(19)
Net loss attributable to common shareholders		$ 531		(257)
HC Government Realty Trust, Inc [Member]
Equity Method Investment, Ownership Percentage		28.00%	28.00%		28.00%
Investment in affiliate, balance		$ 5,171	$ 5,171		$ 5,171
Loss recorded in the Consolidated Statements of Operations	[1]	$ 0			$ (41)
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member]
Equity Method Investment, Ownership Percentage	[2]	27.90%	27.90%		27.90%
Investment in affiliate, balance	[2]	$ 5,166	$ 5,166		$ 5,166
Loss recorded in the Consolidated Statements of Operations	[1],[2]	$ 0			$ (41)
HC Government Realty Trust, Inc [Member] | Common Stock of Investee [Member]
Equity Method Investment, Ownership Percentage		0.10%	0.10%		0.10%
Investment in affiliate, balance		$ 5	$ 5		$ 5
Loss recorded in the Consolidated Statements of Operations	[1]	0			$ 0
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | ACMAT Corporation [Member]
Total revenue			564
Total expense			374
Pre-tax earnings			190
Income tax benefit			30
Net earnings			$ 220
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | HC Realty [Member]
Total revenue		5,521		5,340
Total expense		7,908		8,320
Net earnings		(2,387)		(2,980)
Net loss attributable to noncontrolling interest in operating partnership		(1,813)		(1,998)
Net loss attributable to common shareholders		$ (574)		$ (982)

[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.