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Note 1 - Preparation of Interim Unaudited Financial Statements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 29, 2020
Apr. 09, 2020
Apr. 03, 2020
Mar. 19, 2019
Jun. 29, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Mar. 31, 2018
Financing Receivable, after Allowance for Credit Loss, Total                 $ 7,400,000
Payments to Acquire Equity Method Investments           $ (0) $ 8,250,000    
HC Government Realty Trust, Inc [Member]                  
Ownership Percentage           36.40%      
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   $ 10,250,000  
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, 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