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Note 5 - Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
June 30,
   
December 31,
 
   
20
20
   
201
9
 
                 
Accounts receivable - current
  $
329,126
    $
139,785
 
Accounts receivable - non current
   
1,720,000
     
1,720,000
 
Total accounts receivable
   
2,049,126
     
1,859,785
 
                 
Allowance for doubtful accounts - current
   
(13,785
)
   
(13,785
)
Allowance for doubtful accounts - non current
   
(1,720,000
)
   
(1,720,000
)
Total allowance for doubtful accounts
   
(1,733,785
)
   
(1,733,785
)
                 
Accounts receivable, net of allowance for doubtful accounts
  $
315,341
    $
126,000