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Note 5 - Investment in Affiliate (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Jun. 29, 2020
Apr. 09, 2020
Apr. 03, 2020
Mar. 19, 2019
Jun. 29, 2020
Dec. 31, 2020
Dec. 31, 2019
Payments to Acquire Equity Method Investments           $ 8,250,000 $ 5,000,000
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 $ 4,750,000       $ 8,250,000    
Convertible Preferred Stock of Investee, Shares Issued Upon Conversion (in shares)           1  
Convertible Preferred Stock, Maximum Conversion Price (in dollars per share)           $ 9.10  
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      
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      
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