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Note 5 - Revenue from Contracts with Customers - Revenue by Sales Channel (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues $ 411,172 $ 362,963 $ 321,607
Sales Channel, Directly to Consumer [Member]      
Revenues 242,709 212,296 186,130
Sales Channel, Through Intermediary [Member]      
Revenues $ 168,463 $ 150,667 $ 135,477