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Note 4 - Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Receivables with Imputed Interest [Table Text Block]
  

December 31,

 
  

2020

  

2019

 
         

Trade accounts

 $3,537,864  $3,346,215 

Premiums

  832,221   971,963 

Allowance for doubtful accounts

  (328,522)  (127,635)
         

Total Accounts Receivable, net

 $4,041,563  $4,190,543