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Note 9 - Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net sales $ 73,812 $ 69,971 $ 146,123 $ 138,894
Transferred over Time [Member]        
Net sales 58,748 57,649 118,805 118,527
Transferred at Point in Time [Member]        
Net sales $ 15,064 $ 12,322 $ 27,318 $ 20,367