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Note 11 - Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net sales $ 77,632 $ 75,226 $ 216,526 $ 207,072
Transferred over Time [Member]        
Net sales 65,077 75,226 183,604 207,072
Transferred at Point in Time [Member]        
Net sales $ 12,555 $ 0 $ 32,922 $ 0