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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant, and Equipment, Useful Life [Table Text Block]
    In years  
Building
  
 25
-
30
  
Machinery and equipment
  
 3
-
15
  
Projects that prolong the life and increase efficiency of machinery
  
 3
-
5
  
Light Machinery
  
 5
-
10
  
Heavy Machinery
  
 10
-
15
  
Office furniture and equipment
  
 5
-
8
  
Intellectual Property
  
 9
-
15
  
Leasehold improvements
  
 5
-
8
  
Furniture and equipment at customer locations
  
 1
-
3