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Note 10 - Subsequent Events (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 26, 2019
Mar. 19, 2019
Mar. 15, 2019
Feb. 07, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Stock Repurchased During Period, Value           $ 133,000 $ 136,000  
Escrow Deposit           7,500,000    
Cash Deposits Held           $ 224,000    
Financing Receivable, Net, Total               $ 7,400,000
Common Stock [Member]                
Stock Repurchased During Period, Shares           (268,000) (163,000)  
Stock Repurchased During Period, Value           $ 4,000  
Subsequent Event [Member]                
Escrow Deposit Disbursements Related to Property Acquisition         $ 3,500,000      
Share of Escrow Release     $ 1,200,000          
Subsequent Event [Member] | HC Government Realty Trust, Inc [Member] | Common Stock [Member]                
Equity Securities, FV-NI, Cost   $ 3,000,000            
Investment, Shares Purchased During Period   300,000            
Subsequent Event [Member] | HC Government Realty Trust, Inc [Member] | Series B Preferred Stock [Member]                
Preferred Stock, Dividend Rate, Percentage   10.00%            
Equity Securities, FV-NI, Cost   $ 2,000,000            
Investment, Shares Purchased During Period   200,000            
Subsequent Event [Member] | HC Government Realty Trust, Inc [Member] | Series B Preferred Stock [Member] | Investors Affiliated with the Hale Partnership [Member]                
Equity Securities, FV-NI, Cost   $ 8,500,000            
Investment, Shares Purchased During Period   850,000            
Subsequent Event [Member] | S&L Subordinated Notes Receivable [Member]                
Proceeds from Collection of Notes Receivable $ 704,000              
Notes, Loans and Financing Receivable, Gross, Current $ 3,696,000              
Subsequent Event [Member] | Senior Secured Term Loan [Member]                
Financing Receivable, Net, Total   $ 2,000,000            
Subsequent Event [Member] | Senior Secured Term Loan [Member] | The Lenders [Member]                
Financing Receivable, Net, Total   $ 10,500,000            
Subsequent Event [Member] | VIRGIN ISLANDS, BRITISH                
Stock Repurchased During Period, Shares       2,500        
Stock Repurchased During Period, Value       $ 120,000        
A&R Note [Member] | Subsequent Event [Member]                
Repayments of Debt       180,000        
Debt Instrument, Fair Value Disclosure, Total       $ 3,201,536