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Note 4 - Receivables (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
June 30
,
2018
    
December 31,
2017
  
                 
Trade receivables
   $
52,615
     $
64,387
  
Other receivables
    
58,124
      
355,839
  
     
110,739
      
420,226
  
Less allowance for doubtful accounts
    
(1,975
)
    
(305,895
)
Accounts and other receivables, net
   $
108,764
     $
114,331