Note 1 - Preparation of Interim Unaudited Financial Statements (Details Textual)					3 Months Ended
	Jun. 29, 2020 shares	Apr. 09, 2020 shares	Apr. 03, 2020 shares	Mar. 19, 2019 USD ($) shares	Mar. 31, 2023 ft² a shares	Jun. 29, 2020 USD ($)
HC Government Realty Trust, Inc [Member]
Ownership Percentage					33.90%
HC Government Realty Trust, Inc [Member] | Common Stock of Investee [Member]
Investment Owned, Balance, Shares (in shares)					300,000
Equity Method Investment, Shares Purchased During Period (in shares)				300,000
Payments to Acquire Equity Method Investments | $				$ 3,000,000
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member]
Investment Owned, Balance, Shares (in shares)					1,025,000
Investment Interest Rate					10.00%
Equity Method Investment, Shares Purchased During Period (in shares)	475,000	250,000	100,000	200,000
Payments to Acquire Equity Method Investments | $				$ 2,000,000		$ 8,250,000
HC Government Realty Trust, Inc [Member]
Area of Real Estate Property (Square Foot) | a					663,000
Number of Real Estate Properties					35
Number of States in which Entity Operates					22
Percentage of Real Estate Leased to Government					98.00%
Number of Government Agencies					12
Weighted Average Lease Term, No Early Termination (Year)					9 years 6 months
Weighted Average Lease Term, With Early Termination (Year)					5 years 10 months 24 days
HC Government Realty Trust, Inc [Member] | Wholly Owned Properties [Member]
Number of Real Estate Properties					32
HC Government Realty Trust, Inc [Member] | Subject to Ground Lease [Member]
Number of Real Estate Properties					1
HC Government Realty Trust, Inc [Member] | Minimum [Member]
Area of Real Estate Property (Square Foot) | ft²					10,000
HC Government Realty Trust, Inc [Member] | Maximum [Member]
Area of Real Estate Property (Square Foot) | ft²					100,000
Protected Cell [Member] | Catastrophic Windstorm Reinsurance Protection [Member]
Reinsurance, Reinsurance Protection, Number of Insurance Policies In-force					0