Note 4 - Investments - Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Net investment income	$ 1,058	$ 1,765
Cash and Cash Equivalents [Member]
Interest income	337	266
Fixed Income Securities [Member]
Interest income	102	194
Series B Cumulative Convertible Preferred Stock [Member] \| HC Government Realty Trust, Inc [Member]
Dividends on investment in HC Series B Stock	256	1,025
Partnership [Member]
Change in NAV of investment in limited partnership	$ 363	$ 280

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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