Note 2 - Revenue - Disaggregation of Revenue (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
Automotive [Member]
Revenues	34,663	28,864	71,725	55,276
Consumer Products and Food and Beverage [Member]
Revenues	13,527	11,394	27,317	22,815
High Technology and Industrial Products [Member]
Revenues	25,363	24,306	50,358	47,148
Life Sciences [Member]
Revenues	$ 10,990	$ 11,394	$ 21,333	$ 22,101