Note 14 - Business Segment Information - Revenue by Region (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Revenues		$ 84,839	$ 74,081	$ 167,810	$ 148,228
North America [Member]
Revenues		41,506	38,998	80,746	76,000
EMEA [Member]
Revenues		27,342	21,379	56,055	43,947
Asia Pacific [Member]
Revenues		10,908	9,571	21,176	19,213
Latin America [Member]
Revenues		5,083	4,133	9,833	9,068
Reportable Geographical Components [Member] | North America [Member]
Revenues	[1]	41,506	38,998	80,746	76,000
Reportable Geographical Components [Member] | EMEA [Member]
Revenues		27,342	21,379	56,055	43,947
Reportable Geographical Components [Member] | Asia Pacific [Member]
Revenues		10,908	9,571	21,176	19,213
Reportable Geographical Components [Member] | Latin America [Member]
Revenues		$ 5,083	$ 4,133	$ 9,833	$ 9,068

[1] Sales into Canada accounted for 3% of North America total revenue in both the three and six months ended July 31, 2021 and for 2% of North America total revenue in both the three and six months ended July 31, 2020.