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Note 9 - Income Taxes (Tables)
 3 Months Ended
Apr. 30, 2020
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
Jurisdiction
  
April 30,
2020
    
January 31,
2020
  
U.S. federal and state
   $
30.9
     $
30.3
  
Ireland
    
11.0
      
11.6
  
Brazil
    
6.3
      
5.7
  
Germany
    
2.5
      
2.6
  
Hong Kong
    
0.6
      
0.6
  
South Africa
    
0.1
      
0.2
  
Total valuation allowance
   $
51.4
     $
51.0