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Note 9 - Segment and Enterprise-wide Disclosures - Net Sales to Unaffiliated Customers by Geography (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net Sales $ 38,368 $ 36,416 $ 114,921 $ 91,818
UNITED STATES        
Net Sales 23,313 22,633 70,453 53,168
GERMANY        
Net Sales 3,369 3,384 9,586 9,377
Other Countries [Member]        
Net Sales $ 11,686 $ 10,399 $ 34,882 $ 29,273