Note 5 - Investments (Details Textual)					1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 29, 2020 shares	Apr. 09, 2020 shares	Apr. 03, 2020 shares	Mar. 19, 2019 USD ($) shares	Jun. 30, 2024 shares	Jun. 29, 2020 USD ($)	Dec. 31, 2025 USD ($) shares	Dec. 31, 2024 USD ($)	Jun. 30, 2025	Apr. 21, 2025	Sep. 30, 2024 USD ($) $ / shares	Jun. 29, 2024 shares
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures							$ 18,841,000	$ 10,073,000
Equity in Earnings of Related Parties Equity Method Investees							(114,000)	0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments							0
Related Party [Member]
Investments							1,100,000	808,000
Equity Securities, FV-NI, Gain (Loss)							891,000	465,000
Related Party [Member] | Accounts Receivable [Member]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval							526,000	3,000
Related Party [Member] | Accounts Payable [Member]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval							355,000	136,000
US Government Agencies Debt Securities [Member]
Debt Securities, Held-to-Maturity, Credit Loss Expense (Reversal)							$ 0	0
HC Government Realty Trust, Inc [Member] | Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio					1,200
HC Government Realty Trust, Inc [Member]
Ownership Percentage							28.00%
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member]
Equity Method Investment, Aggregate Cost											$ 10,250,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares											$ 10
Convertible Preferred Stock, Maximum Conversion Price (in dollars per share) | $ / shares											$ 9.1
Equity Method Investment, Other-than-Temporary Impairment							$ 4,100,000	994,000
HC Government Realty Trust, Inc [Member] | Common Stock of Investee [Member]
Equity Method Investment, Other-than-Temporary Impairment								260,000
HC Government Realty Trust, Inc [Member] | Common Stock of Investee [Member]
Investment Owned, Balance, Shares (in shares) | shares					250		250					300,000
Equity Method Investment, Shares Purchased During Period (in shares) | shares				300,000
Equity Method Investment, Aggregate Cost				$ 3,000,000
HC Government Realty Trust, Inc [Member] | Common Stock of Investee [Member] | Investors Affiliated with the Hale Partnership [Member]
Equity Method Investment, Shares Purchased During Period (in shares) | shares				850,000
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member]
Investment Owned, Balance, Shares (in shares) | shares							1,025,000
Equity Method Investment, Shares Purchased During Period (in shares) | shares	475,000	250,000	100,000	200,000
Equity Method Investment, Aggregate Cost				$ 2,000,000
Payments to Acquire Equity Method Investments						$ 8,250,000
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member] | Investors Affiliated with the Hale Partnership [Member]
Equity Method Investment, Aggregate Cost				$ 8,500,000
ACMAT Corporation [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures							$ 12,600,000
Equity in Earnings of Related Parties Equity Method Investees							$ 114,000	$ 0
ACMAT Corporation [Member]
Ownership Percentage										39.10%
Assignment and Contribution Agreement [Member] | ACMAT Corporation [Member]
Subsidiary, Ownership Percentage, Parent									39.10%
Minority Interest, Voting Power									10.40%	10.40%