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v3.23.1

Note 1 - Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2023
Notes Tables |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | March 31, 2023 |  |  | December 31, 2022 |
Allowance for doubtful accounts at the beginning of the period |  | $ | 59,559 |  |  | $ | 409,076 |
Bad debt expense |  |  | - |  |  |  | (24,534 | )
Receivables written off during the periods |  |  | - |  |  |  | (295,778 | )
Effect of currency translation |  |  | 1,069 |  |  |  | (29,205 | )
Allowance for doubtful accounts at the end of the period |  | $ | 60,628 |  |  | $ | 59,559 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  |  |  |  |  |  |  |  |  | For the Three months |
|  | % Distribution |  |  | Ended March 31, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Americas |  |  | 9 | % |  |  | 4 | % |  | $ | 333,530 |  |  | $ | 139,307 |
Asia-Pacific |  |  | 11 | % |  |  | 23 | % |  |  | 451,895 |  |  |  | 835,365 |
Europe |  |  | 77 | % |  |  | 73 | % |  |  | 3,099,785 |  |  |  | 2,662,564 |
Middle East & Africa |  |  | 3 | % |  |  | - | % |  |  | 126,309 |  |  |  | - |
|  |  | 100 | % |  |  | 100 | % |  | $ | 4,011,519 |  |  | $ | 3,637,236 |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  |  |  |  |  |  |  |  |  | For the Three Months |
|  | % Distribution |  |  | Ended March 31, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Water |  |  | 36 | % |  |  | 16 | % |  | $ | 1,434,919 |  |  | $ | 592,990 |
Ceramics |  |  | 35 | % |  |  | 52 | % |  |  | 1,409,372 |  |  |  | 1,880,118 |
Plastics |  |  | 29 | % |  |  | 31 | % |  |  | 1,167,228 |  |  |  | 1,138,597 |
Corporate |  |  | - | % |  |  | 1 | % |  |  | - |  |  |  | 25,530 |
|  |  | 100 | % |  |  | 100 | % |  | $ | 4,011,519 |  |  | $ | 3,637,236 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | March 31, 2023 |  |  | December 31, 2022 |
Cost incurred |  | $ | 4,338,453 |  |  | $ | 3,860,179 |
Unbilled project deliveries |  |  | 506,509 |  |  |  | 950,105 |
VAT |  |  | 327,718 |  |  |  | 229,006 |
Other receivables |  |  | 75,804 |  |  |  | 45,814 |
Prepayments |  |  | (3,445,720 | ) |  |  | (3,363,039 | )
Deferred Revenue |  |  | (65,701 | ) |  |  | (118,327 | )
|  | $ | 1,737,063 |  |  | $ | 1,603,738 |
Distributed as follows: |  |  |  |  |  |  |  |
Contract assets |  | $ | 2,447,668 |  |  | $ | 2,253,295 |
Contract liabilities |  |  | (710,604 | ) |  |  | (649,557 | )
|  | $ | 1,737,063 |  |  | $ | 1,603,738 |

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