Note 3 - Investment in Affiliate (Details Textual) - HC Government Realty Trust, Inc [Member] - Series B Cumulative Convertible Preferred Stock [Member] $ / shares in Units, $ in Thousands	Jun. 30, 2023 USD ($) $ / shares shares
Equity Method Investment, Aggregate Cost | $	$ 10,250
Convertible Preferred Stock of Investee, Shares Issued Upon Conversion (in shares) | shares	1
Convertible Preferred Stock, Maximum Conversion Price (in dollars per share) | $ / shares	$ 9.10