Note 13 - Business Segment Information - Revenue by Region (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Revenues		$ 84,543	$ 75,958	$ 170,733	$ 147,340
North America [Member]
Revenues		39,288	35,156	79,313	68,526
EMEA [Member]
Revenues		26,906	22,227	51,993	43,108
Asia Pacific [Member]
Revenues		12,866	12,967	25,425	25,133
Latin America [Member]
Revenues		5,483	5,608	14,002	10,573
Reportable Geographical Components [Member] | North America [Member]
Revenues	[1]	39,288	35,156	79,313	68,526
Reportable Geographical Components [Member] | EMEA [Member]
Revenues		26,906	22,227	51,993	43,108
Reportable Geographical Components [Member] | Asia Pacific [Member]
Revenues		12,866	12,967	25,425	25,133
Reportable Geographical Components [Member] | Latin America [Member]
Revenues		$ 5,483	$ 5,608	$ 14,002	$ 10,573

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