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Note 6 - Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Gross Carrying Amount | $ 46,435 | $ 42,160
Accumulated Amortization | (36,526) | (34,263)
Customer Relationships | 9,909 | 7,897
Customer Relationships [Member] |  |
Gross Carrying Amount | 28,300 | 28,300
Accumulated Amortization | (27,509) | (26,324)
Customer Relationships | 791 | 1,976
Intellectual Property [Member] |  |
Gross Carrying Amount | 18,135 | 13,860
Accumulated Amortization | (9,017) | (7,939)
Customer Relationships | $ 9,118 | $ 5,921

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