Note 6 - Business Combination - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 05, 2021	Jan. 31, 2021	Dec. 31, 2020
Goodwill	$ 32,507		$ 25,336
Foreign-Trade Zone Corporation [Member]
Tangible assets, including cash acquired of $3.5 million		$ 4,194
Goodwill		7,217
Other intangible assets		8,280
Total assets acquired		19,691
Liabilities assumed		(1,668)
Deferred tax liability		(1,951)
Net assets acquired		$ 16,072
Allocation Network GmbH [Member]
Tangible assets, including cash acquired of $3.5 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