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Note 1 - Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | September 30, 2022 |  |  | December 31, 2021 |
Allowance for doubtful accounts at the beginning of the period |  | $ | 409,076 |  |  | $ | 498,044 |
Bad debt expense |  |  | 91,519 |  |  |  | (28,499 | )
Receivables written off during the periods |  |  | (298,850 | ) |  |  | (24,415 | )
Effect of currency translation |  |  | (40,434 | ) |  |  | (36,054 | )
Allowance for doubtful accounts at the end of the period |  | $ | 161,311 |  |  | $ | 409,076 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | For the Three Months |  |  | For the Nine Months |
|  | Ended September 30, |  |  | Ended September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Americas |  | $ | 382,573 |  |  | $ | 211,575 |  |  | $ | 861,260 |  |  | $ | 573,365 |
Asia-Pacific |  |  | 895,696 |  |  |  | 636,622 |  |  |  | 2,944,449 |  |  |  | 3,225,691 |
Europe |  |  | 1,903,930 |  |  |  | 3,294,757 |  |  |  | 6,651,065 |  |  |  | 8,358,338 |
Middle East & Africa |  |  | 123,335 |  |  |  | - |  |  |  | 1,504,288 |  |  |  | - |
|  | $ | 3,305,534 |  |  | $ | 4,142,954 |  |  | $ | 11,961,062 |  |  | $ | 12,157,394 |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | For the Three Months |  |  | For the Nine Months |
|  | Ended September 30, |  |  | Ended September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Water |  | $ | 785,046 |  |  | $ | 1,493,549 |  |  | $ | 3,522,049 |  |  | $ | 3,730,889 |
Ceramics |  |  | 1,854,981 |  |  |  | 1,703,057 |  |  |  | 5,548,951 |  |  |  | 5,444,863 |
Plastics |  |  | 665,507 |  |  |  | 855,896 |  |  |  | 2,839,809 |  |  |  | 2,686,292 |
Corporate |  |  | - |  |  |  | 90,452 |  |  |  | 50,253 |  |  |  | 295,350 |
|  | $ | 3,305,534 |  |  | $ | 4,142,954 |  |  | $ | 11,961,062 |  |  | $ | 12,157,394 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | September 30, 2022 |  |  | December 31, 2021 |
Cost incurred |  | $ | 3,602,967 |  |  | $ | 3,381,994 |
Unbilled project deliveries |  |  | 667,670 |  |  |  | 454,158 |
VAT |  |  | 383,701 |  |  |  | 542,255 |
Other receivables |  |  | 9,240 |  |  |  | 60,158 |
Prepayments |  |  | (3,082,635 | ) |  |  | (2,947,736 | )
Deferred Revenue |  |  | (137,638 | ) |  |  | (499,146 | )
|  | $ | 1,443,305 |  |  | $ | 991,682 |
Distributed as follows: |  |  |  |  |  |  |  |
Contract assets |  | $ | 2,078,472 |  |  | $ | 1,906,510 |
Contract liabilities |  |  | (635,167 | ) |  |  | (914,828 | )
|  | $ | 1,443,305 |  |  | $ | 991,682 |

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