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Note 5 - Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | 2020 |  |  | 2019 |
Customer relationships |  | $ | 544,770 |  |  | $ | 494,315 |
Patent cost |  |  | 204,731 |  |  |  | 135,683 |
|  |  | 749,501 |  |  |  | 629,998 |
Less Accumulated amortization |  |  | (269,441 | ) |  |  | (141,282 | )
Intangible assets, net |  | $ | 480,060 |  |  | $ | 488,716 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Year ending December 31, |  | Amortization Expenses |
2021 |  |  | 117,488 |
2022 |  |  | 117,489 |
2023 |  |  | 117,488 |
2024 |  |  | 81,171 |
2025 |  |  | 8,535 |
Thereafter |  |  | 37,889 |
|  | $ | 480,060 |

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