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Note 6 - Investment in Affiliate (Details Textual) - HC Government Realty Trust, Inc [Member] - USD ($)
3 Months Ended
Jun. 29, 2020
Apr. 09, 2020
Apr. 03, 2020
Mar. 19, 2019
Jun. 29, 2020
Dec. 31, 2022
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  
Convertible Preferred Stock of Investee, Shares Issued Upon Conversion (in shares)           1
Convertible Preferred Stock, Maximum Conversion Price (in dollars per share)           $ 9.10
Series B Cumulative Convertible Preferred Stock [Member] | Investors Affiliated with the Hale Partnership [Member]            
Equity Method Investment, Aggregate Cost       $ 8,500,000    
Common Stock of Investee [Member]            
Equity Method Investment, Shares Purchased During Period (in shares)       300,000    
Equity Method Investment, Aggregate Cost       $ 3,000,000    
Common Stock of Investee [Member] | Investors Affiliated with the Hale Partnership [Member]            
Equity Method Investment, Shares Purchased During Period (in shares)       850,000