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Note 6 - Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | 2021 |  |  | 2020 |
Customer relationships |  | $ | 502,957 |  |  | $ | 544,770 |
Patent cost |  |  | 189,017 |  |  |  | 204,731 |
|  |  | 691,974 |  |  |  | 749,501 |
Less Accumulated amortization |  |  | (357,231 | ) |  |  | (269,441 | )
Intangible assets, net |  | $ | 334,743 |  |  | $ | 480,060 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Year ending December 31, |  | Amortization Expenses |
2022 |  |  | 108,471 |
2023 |  |  | 108,471 |
2024 |  |  | 74,940 |
2025 |  |  | 7,880 |
2026 |  |  | 7,880 |
Thereafter |  |  | 27,101 |
|  | $ | 334,743 |

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