Note 13 - Business Segment Information - Revenue by Region (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Revenue		$ 75,958	$ 69,778	$ 147,340	$ 135,175
Reportable Geographical Components [Member] | North America [Member]
Revenue	[1]	35,156	32,815	68,526	62,334
Reportable Geographical Components [Member] | EMEA [Member]
Revenue		22,227	19,835	43,108	39,627
Reportable Geographical Components [Member] | Asia Pacific [Member]
Revenue		12,967	12,137	25,133	23,817
Reportable Geographical Components [Member] | Latin America [Member]
Revenue		$ 5,608	$ 4,991	$ 10,573	$ 9,397

[1] Sales into Canada accounted for 1% of North America total revenue in the three and six months ended July 31, 2017 and for 2% of North America total revenue in the three and six months ended July 31, 2016.