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Note 6 - Intangible Assets - Expected Future Amortization Expense (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
2022 $ 108,471  
2023 108,471  
2024 74,940  
2025 7,880  
2026 7,880  
Thereafter 27,101  
Intangible assets, net $ 334,743 $ 480,060