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Note 5 - Intangible Assets and Goodwill - Future Amortization Expense (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
2022 $ 32,000  
2023 32,000  
2024 32,000  
2025 32,000  
Thereafter 47,000  
Total $ 175,000 $ 215,000