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Note 11 - Revenues - Deferred Revenue (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Deferred revenue $ 3,623 $ 3,771
Service [Member]    
Deferred revenue 1,839 1,629
Customer Advances [Member]    
Deferred revenue $ 1,784 $ 2,142