Note 7 - Business Combination - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jan. 31, 2021	Dec. 31, 2020	Jan. 31, 2020	Jan. 31, 2019
Goodwill	$ 25,336		$ 12,388	$ 12,423
Allocation Network GmbH [Member]
Tangible assets, including cash acquired of $0.9 million		$ 3,420
Goodwill		12,785
Other intangible assets		7,751
Total assets acquired		23,956
Liabilities assumed		(1,576)
Deferred tax liability		(2,549)
Net assets acquired		$ 19,831