Note 1 - Preparation of Interim Unaudited Financial Statements (Details Textual)					3 Months Ended		6 Months Ended
	Jun. 29, 2020 shares	Apr. 09, 2020 shares	Apr. 03, 2020 shares	Mar. 19, 2019 USD ($) shares	Jun. 30, 2023 USD ($) ft² a shares	Jun. 29, 2020 USD ($)	Jun. 30, 2023 ft² a shares
Management Advisory Services [Member] | Related Captive Managing General Agency [Member]
Related Party Transaction, Amounts of Transaction | $					$ 200,000
Management Advisory Services [Member] | Reinsurance Intermediary [Member]
Related Party Transaction, Amounts of Transaction | $					$ 50,000
HC Government Realty Trust, Inc [Member]
Ownership Percentage					26.05%		26.05%
HC Government Realty Trust, Inc [Member] | Common Stock of Investee [Member]
Investment Owned, Balance, Shares (in shares) | shares					300,000		300,000
Equity Method Investment, Shares Purchased During Period (in shares) | 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) | shares					1,025,000		1,025,000
Investment Interest Rate					10.00%		10.00%
Equity Method Investment, Shares Purchased During Period (in shares) | 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		663,000
Number of Real Estate Properties					35		35
Number of States in which Entity Operates					22		22
Percentage of Real Estate Leased to Government					98.00%		98.00%
Number of Government Agencies					12		12
Weighted Average Lease Term, No Early Termination (Year)							9 years 2 months 12 days
Weighted Average Lease Term, With Early Termination (Year)							5 years 8 months 12 days
HC Government Realty Trust, Inc [Member] | Wholly Owned Properties [Member]
Number of Real Estate Properties					33		33
HC Government Realty Trust, Inc [Member] | Subject to Ground Lease [Member]
Number of Real Estate Properties					2		2
HC Government Realty Trust, Inc [Member] | Minimum [Member]
Area of Real Estate Property (Square Foot) | ft²					10,000		10,000
HC Government Realty Trust, Inc [Member] | Maximum [Member]
Area of Real Estate Property (Square Foot) | ft²					100,000		100,000
Protected Cell [Member] | Catastrophic Windstorm Reinsurance Protection [Member]
Reinsurance, Reinsurance Protection, Number of Insurance Policies In-force					0		0