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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Estimated Useful Lives for Each Asset Group [Table Text Block]
Buildings and improvements
(in years)
 20
to
30
or term of lease if applicable
  
Machinery and equipment
(in years)
 7
to
15
 
  
Furniture and fixtures
(in years)
 5
to
7
 
  
Computer hardware and software
(in years)
 3
to
7