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Note 11 - Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net sales $ 69,971 $ 69,203 $ 138,894 $ 131,846
Transferred over Time [Member]        
Net sales 57,649 69,203 118,527 131,846
Transferred at Point in Time [Member]        
Net sales $ 12,322 $ 0 $ 20,367 $ 0