Note 13 - Business Segment Information - Revenue by Region (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Revenue		$ 76,925	$ 69,534	$ 224,265	$ 204,709
Reportable Geographical Components [Member] | North America [Member]
Revenue	[1]	37,319	33,413	105,845	95,747
Reportable Geographical Components [Member] | EMEA [Member]
Revenue		21,439	19,334	64,547	58,961
Reportable Geographical Components [Member] | Asia Pacific [Member]
Revenue		12,550	11,932	37,683	35,749
Reportable Geographical Components [Member] | Latin America [Member]
Revenue		$ 5,617	$ 4,855	$ 16,190	$ 14,252

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