Note 13 - Business Segment Information - Revenue by Region (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Revenues		$ 79,577	$ 76,925	$ 250,310	$ 224,265
North America [Member]
Revenues		39,870	37,319	119,183	105,845
EMEA [Member]
Revenues		22,549	21,439	74,542	64,547
Asia Pacific [Member]
Revenues		12,348	12,550	37,773	37,683
Latin America [Member]
Revenues		4,810	5,617	18,812	16,190
Reportable Geographical Components [Member] | North America [Member]
Revenues	[1]	39,870	37,319	119,183	105,845
Reportable Geographical Components [Member] | EMEA [Member]
Revenues		22,549	21,439	74,542	64,547
Reportable Geographical Components [Member] | Asia Pacific [Member]
Revenues		12,348	12,550	37,773	37,683
Reportable Geographical Components [Member] | Latin America [Member]
Revenues		$ 4,810	$ 5,617	$ 18,812	$ 16,190

[1] Sales into Canada accounted for 2% of North America total revenue in the three and nine months ended October 31, 2018 and 2017.