Note 1 - Preparation of Interim Unaudited Financial Statements (Details Textual) - USD ($)						3 Months Ended	9 Months Ended
		Jun. 29, 2020	Apr. 09, 2020	Apr. 03, 2020	Mar. 19, 2019	Jun. 29, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Payments to Acquire Equity Method Investments							$ 8,250,000	$ 5,000,000
Senior Secured Term Loan [Member]
Notes Receivable, Related Parties					$ 2,000,000
The Lenders [Member] | Senior Secured Term Loan [Member]
Notes Receivable, Related Parties					$ 10,500,000
HC Government Realty Trust, Inc [Member]
Equity Method Investment, Ownership Percentage							37.00%		16.40%
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member]
Equity Method Investment, Shares Purchased During Period (in shares)		475,000	250,000	100,000	200,000
Preferred Stock, Dividend Rate, Percentage					10.00%
Equity Method Investment, Aggregate Cost					$ 2,000,000		$ 10,250,000
Payments to Acquire Equity Method Investments						$ 8,250,000
Equity Method Investment, Ownership Percentage	[1]						29.20%		7.90%
HC Government Realty Trust, Inc [Member] | Series B Cumulative Convertible Preferred Stock [Member] | Investors Affiliated with the Hale Partnership [Member]
Equity Method Investment, Shares Purchased During Period (in shares)					850,000
Equity Method Investment, Aggregate Cost					$ 8,500,000
HC Government Realty Trust, Inc [Member] | Common Stock of Investee [Member]
Equity Method Investment, Shares Purchased During Period (in shares)					300,000
Equity Method Investment, Aggregate Cost					$ 3,000,000
Equity Method Investment, Ownership Percentage							7.80%		8.50%
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)					850,000

[1] Represents investments in shares of HC Realty preferred stock with a basis of $10.25 million. Each share of preferred stock can be converted into one share of HC Realty common stock at a conversion price equal to the lesser of $9.10 per share or the fair market value per share of HC Realty common stock, subject to adjustment upon the occurrence of certain events.