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Note 4 - Accounts Receivable (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
June 30,
    
December 31,
  
   
201
8
    
201
7
  
                 
Accounts receivable - current
   $
505,436
     $
2,889,731
  
Accounts receivable - non current
    
1,720,000
      
1,760,000
  
     
2,225,436
      
4,649,731
  
Allowance for doubtful accounts - current
    
(13,785
)
    
(13,785
)
Allowance for doubtful accounts - non current
    
(1,000,000
)
    
(1,000,000
)
     
(1,013,785
)
    
(1,013,785
)
Accounts receivable, net of allowance for doubtful accounts
   $
1,211,651
     $
3,635,946