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Note 10 - Revenues - Deferred Revenue (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Deferred revenue $ 3,956 $ 4,266
Service [Member]    
Deferred revenue 1,995 1,976
Customer Advances [Member]    
Deferred revenue $ 1,961 $ 2,290