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Note 9 - Intangible Assets (Details Textual) - USD ($)
$ in Thousands
Jan. 31, 2020
Jan. 31, 2019
Finite-Lived Intangible Assets, Net, Ending Balance $ 256,956 $ 176,192
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 52,700  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 48,300  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 40,700  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 28,900  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 25,900  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 60,500