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Note 15 - Share Capital (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Jul. 16, 2020
Jun. 10, 2019
Jun. 06, 2018
Jan. 31, 2021
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Shares Issued, Price Per Share (in dollars per share)   $ 35.50          
Stock Issued During Period, Shares, New Issues (in shares)   6,900,000     6,900,000
Over-Allotment Option   15.00%          
Stock Issued During Period, Value, New Issues   $ 245.0          
Proceeds from Issuance of Common Stock, Net   $ 236.6          
Proceeds from Stock Options Exercised         $ 6.2 $ 1.5 $ 0.5
Shelf Prospectus [Member]              
Shelf Prospectus Period (Month)     2 years 30 days        
Shelf Prospectus, Maximum Amount     $ 750.0        
The 2020 Base Shelf Prospectus [Member]              
Shelf Prospectus Period (Month) 2 years 30 days            
Shelf Prospectus, Maximum Amount $ 1,000.0            
Stock Issued During Period, Shares, New Issues (in shares)       0