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Note 15 - Business Acquisition (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
Inventory
  $
10,000
 
Machinery and equipment
   
286,900
 
Intellectual property
   
203,100
 
Net tangible assets acquired
  $
500,000
 
Inventory
  $
25,000
 
Machinery and equipment
   
350,000
 
Intellectual property
   
425,000
 
Net tangible assets acquired
  $
800,000