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Note 5 - Accounts Receivable (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
September 30,
    
December 31,
  
   
20
20
    
2019
  
                 
Accounts receivable - current
   $
506,165
     $
139,785
  
Accounts receivable - non current
    
1,720,000
      
1,720,000
  
Total accounts receivable
    
2,226,165
      
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
   $
492,380
     $
126,000