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Note 1 - Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Jun. 29, 2020
Jun. 19, 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
Proceeds from Issuance of Common Stock             12,675,000
Impairment of Notes Receivable             833,000 897,000
Rights Offering [Member]                
Proceeds from Issuance of Common Stock   $ 12,675,000            
Stock Issued During Period, Shares, New Issues (in shares)   19,500,000            
Shares Issued, Price Per Share (in dollars per share)   $ 0.65            
Senior Secured Term Loan [Member]                
Notes Receivable, Related Parties         $ 2,000,000      
Senior Secured Term Loan [Member] | The Lenders [Member]                
Notes Receivable, Related Parties         $ 10,500,000      
S&L Note [Member]                
Impairment of Notes Receivable             $ 833,000 $ 0
HC Government Realty Trust, Inc [Member]                
Ownership Percentage             36.40%  
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] | Series B Cumulative Convertible Preferred Stock [Member]                
Equity Method Investment, Shares Purchased During Period (in shares) 475,000   250,000 100,000 200,000      
Equity Method Investment, Aggregate Cost         $ 2,000,000   $ 10,250,000  
Preferred Stock, Dividend Rate, Percentage         10.00%      
Payments to Acquire Equity Method Investments $ 4,750,000         $ 8,250,000