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Note 18 - Relationship With National Health Corporation (Details Textual)
12 Months Ended
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 1991
USD ($)
Dec. 31, 2016
shares
Common Stock [Member]          
Shares, Outstanding, Ending Balance | shares 15,332,206 15,255,002 15,212,133   15,162,938
National [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 2,000,000        
Payroll and Related Services Administrative Fee Percentage 1.00%        
Payment for Administrative Fees $ 5,131,000 $ 5,064,000 $ 5,134,000    
Employee-related Receivables 1,653,000 3,081,000      
Employee-related Liabilities, Total $ 79,000 $ 80,000      
National [Member] | Common Stock [Member]          
Shares, Outstanding, Ending Balance | shares 1,084,763        
Equity Owned by Related Parties 7.10%        
Loans Payable [Member] | National [Member]          
Notes Payable, Related Parties       $ 10,000,000  
Debt Instrument, Basis Spread on Variable Rate       0.85%  
Line of Credit [Member] | National Health Care [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 2,000,000        
Long-term Line of Credit, Total $ 0        
National [Member]          
Number of Skilled Nursing Centers 5