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Note 1 - Organization, Description of Business and Summary of Significant Accounting Policies - Schedule of Third-party Payers as a Percentage of Total (Details) - Customer Concentration Risk [Member]
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue from Contract with Customer Benchmark [Member]          
Concentrations of credit risk 28.00% 48.00% 33.00% 47.00%  
Revenue from Contract with Customer Benchmark [Member] | Medicare [Member]          
Concentrations of credit risk 18.00% 26.00% 23.00% 24.00%  
Revenue from Contract with Customer Benchmark [Member] | Johnson and Johnson Services Inc JJSI [Member]          
Concentrations of credit risk   11.00%   12.00%  
Revenue from Contract with Customer Benchmark [Member] | United Healthcare [Member]          
Concentrations of credit risk 10.00% 11.00% 10.00% 11.00%  
Accounts Receivable [Member] | Medicare [Member]          
Concentrations of credit risk     11.00%   15.00%
Accounts Receivable [Member] | Johnson and Johnson Services Inc JJSI [Member]          
Concentrations of credit risk         10.00%