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Note 4 - Inventories
12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Inventory Disclosure [Text Block]
Note
4
- Inventories
 
Inventories consist of:                          
   
2016
   
2015
 
                 
Raw materials
  $
3,062,830
    $
2,718,328
 
Work-in-process
   
159,482
     
174,698
 
Finished goods
   
64,227
     
93,404
 
Totals
  $
3,286,539
    $
2,986,430