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Note 3 - Business Combination - Estimated Future Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
2022 (nine months) $ 453  
2023 384  
2024 340  
2025 340  
2026 340  
Thereafter 1,760  
Total intangible assets subject to amortization $ 3,617 $ 0