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Note 15 - Segment and Related Information - Net Assets by Geographic Area (Details) - Continuing Operations [Member] - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Total net assets $ 83,401 $ 76,681
UNITED STATES    
Total net assets 38,641 32,457
GERMANY    
Total net assets 15,501 18,697
UNITED KINGDOM    
Total net assets 13,999 8,867
Rest of the World [Member]    
Total net assets $ 15,260 $ 16,660