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Note 8 - Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net sales $ 72,311 $ 68,923
Transferred over Time [Member]    
Net sales 60,057 60,878
Transferred at Point in Time [Member]    
Net sales $ 12,254 $ 8,045