Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Revenues	$ 82,706	$ 79,577	$ 84,543	$ 86,190	$ 80,753	$ 76,925	$ 75,958	$ 71,382	$ 333,016	$ 305,018	$ 277,973
Automotive [Member]
Revenues									128,249	113,579	96,794
Consumer Products and Food and Beverage [Member]
Revenues									53,637	47,273	47,796
High Technology and Industrial Products [Member]
Revenues									106,658	99,990	91,652
Life Sciences [Member]
Revenues									44,472	44,176	41,731
North America [Member]
Revenues									162,307	141,614	129,436
EMEA [Member]
Revenues									96,989	89,693	81,765
Asia Pacific [Member]
Revenues									51,628	50,689	47,742
Latin America [Member]
Revenues									$ 22,092	$ 23,022	$ 19,030