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Note 11 - Employee Benefit Plans (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Foreign Plan [Member] | Pension Plan [Member]      
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 4.7 $ 5.3 $ 4.4
Foreign Plan [Member] | Pension Plan [Member] | Minimum [Member]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 2.00%    
Foreign Plan [Member] | Pension Plan [Member] | Maximum [Member]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 20.00%    
The 401(k) Plan [Member] | UNITED STATES      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 75.00%    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 4.00%    
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage Increase 25.00%    
Defined Contribution Benefit Plan Employer Matching Contribution Vesting Period (Year) 4 years    
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 2.1 $ 2.2 $ 2.2