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Note 5 - Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Intangible assets | $ 749,501 | $ 629,998
Less Accumulated amortization | (269,441) | (141,282)
Intangible assets, net | 480,060 | 488,716
Customer Relationships [Member] |  |
Intangible assets | 544,770 | 494,315
Patents [Member] |  |
Intangible assets | $ 204,731 | $ 135,683

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