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Note 1 - Organization, Description of Business and Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2020

  

2019

  

2020

  

2019

 

Medicare

  18%  26%  23%  24%

Johnson and Johnson Services, Inc.

  *   11%  *   12%

UnitedHealthcare

  10%  11%  10%  11%
   28%  48%  33%  47%
  

June 30, 2020

  

December 31, 2019

 
Johnson and Johnson Services, Inc.  *   10%

Medicare

  11%  15%
         

*Less than 10%