Note 12 - Business Segment Information - Revenue by Region (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Revenue		$ 80,753	$ 76,925	$ 75,958	$ 71,382	$ 73,264	$ 69,534	$ 69,778	$ 65,397	$ 305,018	$ 277,973	$ 277,852
Poperty and equipment, net		30,408				30,872				30,408	30,872
Reportable Geographical Components [Member] | North America [Member]
Revenue	[1]									141,614	129,436	127,776
Poperty and equipment, net		25,546				26,601				25,546	26,601
Reportable Geographical Components [Member] | EMEA [Member]
Revenue										89,693	81,765	84,268
Poperty and equipment, net		3,444				2,861				3,444	2,861
Reportable Geographical Components [Member] | Asia Pacific [Member]
Revenue										50,689	47,742	46,457
Poperty and equipment, net		1,141				1,075				1,141	1,075
Reportable Geographical Components [Member] | Latin America [Member]
Revenue										23,022	19,030	$ 19,351
Poperty and equipment, net		$ 277				$ 335				$ 277	$ 335

[1] Sales into Canada accounted for 2% of North America total revenue for each of the fiscal years 2018, 2017 and 2016.