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Note 4 - Intangible Assets - Expected Future Amortization Expense (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Expected amortization expense, 2022 $ 218
Expected amortization expense, 2023 181
Expected amortization expense, 2024 0
Expected amortization expense, 2025 0
Expected amortization expense, 2026 0
Customer Relationships [Member]  
Expected amortization expense, 2022 125
Expected amortization expense, 2023 104
Expected amortization expense, 2024 0
Expected amortization expense, 2025 0
Expected amortization expense, 2026 0
Patents and Trademarks [Member]  
Expected amortization expense, 2022 93
Expected amortization expense, 2023 77
Expected amortization expense, 2024 0
Expected amortization expense, 2025 0
Expected amortization expense, 2026 $ 0