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Note 4 - Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Receivables with Imputed Interest [Table Text Block]
  

June 30,

  

December 31,

 
  

2020

  

2019

 
         

Trade accounts

 $3,368,453  $3,346,215 

Premiums

  887,513   971,963 

Allowance for doubtful accounts

  (150,181)  (127,635)
         

Total Accounts Receivable, net

 $4,105,785  $4,190,543