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Note 16 - Segment and Related Information - Revenue From External Customers by Geographic Areas (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Total revenues $ 102,100 $ 116,176
UNITED STATES    
Total revenues 102,100  
Continuing Operations [Member]    
Total revenues 102,100 116,176
Continuing Operations [Member] | UNITED STATES    
Total revenues 42,054 47,792
Continuing Operations [Member] | Europe [Member]    
Total revenues 29,938 35,128
Continuing Operations [Member] | Asia [Member]    
Total revenues 23,884 25,041
Continuing Operations [Member] | Rest of the World [Member]    
Total revenues $ 6,224 $ 8,215