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Note 11 - Acquisition (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Consideration
   $
137.6
  
Cash
    
0.7
  
Accounts receivable
    
9.4
  
Other current assets
    
1.4
  
Property and equipment
    
14.9
  
Intangibles
    
75.5
  
Accounts payable
    
(3.9
 )
Accrued Liabilities
    
(0.2
 )
Goodwill
   $
39.8