Note 10 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
United States Defined Benefits Pension Plan [Member] | The 401(k) Plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	75.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	4.00%
Defined Contribution Benefit Plan Employer Matching Contribution Vesting Period	5 years
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 2.1	$ 1.8	$ 1.8
Foreign Defined Benefits Pension Plan [Member] | Foreign Subsidiaries Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 4.8	$ 4.8	$ 5.0
Foreign Defined Benefits Pension Plan [Member] | Foreign Subsidiaries Plan [Member] | Minimum [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	3.00%
Foreign Defined Benefits Pension Plan [Member] | Foreign Subsidiaries Plan [Member] | Maximum [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	21.00%