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Note 5 - Non-operating Income (Details Textual) - USD ($)
3 Months Ended
Feb. 27, 2020
Mar. 31, 2020
Mar. 31, 2019
Feb. 26, 2020
Gain (Loss) on Acquisition of Equity Method Investment   $ 1,707,000 $ (0)  
Skilled Nursing Facility in Knoxville, Tennessee [Member]        
Goodwill, Acquired During Period $ 346,000      
Nonoperating Income (Expense) [Member]        
Gain (Loss) on Acquisition of Equity Method Investment $ 1,707,000      
Caris [Member]        
Equity Method Investment, Ownership Percentage   75.10%    
Skilled Nursing Facility in Knoxville, Tennessee [Member]        
Equity Method Investment, Ownership Percentage       25.00%