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Note 6 - Non-operating Income (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Feb. 27, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Gain (Loss) on Acquisition of Equity Method Investment   $ 0 $ 0   $ 1,707,000 $ 1,975,000  
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     $ 1,975,000      
Caris [Member]              
Equity Method Investment, Ownership Percentage   75.10%     75.10%    
Equity Method Investments   $ 35,035,000     $ 35,035,000   $ 36,673,000
Skilled Nursing Facility in Knoxville, Tennessee [Member]              
Equity Method Investment, Ownership Percentage 25.00%