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Note 4 - Goodwill and Other Intangible Assets - Estimated Future Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Total $ 1,173 $ 1,343
Finite-lived Intangible Assets, Excluding Projects in Process [Member]    
2021 185  
2022 185  
2023 185  
2024 113  
2025 41  
Thereafter 387  
Total $ 1,096