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Note 1 - Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | June 30, 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 |  |  | (10,299 | ) |  |  | (295,778 | )
Effect of currency translation |  |  | 970 |  |  |  | (29,205 | )
Allowance for doubtful accounts at the end of the period |  | $ | 50,230 |  |  | $ | 59,559 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | For the Three Months |  |  | For the Six Months |
|  | Ended June 30, |  |  | Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Americas |  | $ | 441,186 |  |  | $ | 339,380 |  |  | $ | 774,717 |  |  | $ | 478,688 |
Asia-Pacific |  |  | 650,095 |  |  |  | 1,213,389 |  |  |  | 1,101,989 |  |  |  | 2,048,753 |
Europe |  |  | 3,119,496 |  |  |  | 2,084,570 |  |  |  | 6,219,282 |  |  |  | 4,747,134 |
Middle East & Africa |  |  | 779,242 |  |  |  | 1,380,953 |  |  |  | 905,550 |  |  |  | 1,380,953 |
|  | $ | 4,990,019 |  |  | $ | 5,018,292 |  |  | $ | 9,001,538 |  |  | $ | 8,655,528 |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | For the Three Months |  |  | For the Six Months |
|  | Ended June 30, |  |  | Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Water |  | $ | 2,070,298 |  |  | $ | 2,144,011 |  |  | $ | 3,505,217 |  |  | $ | 2,737,002 |
Ceramics |  |  | 1,789,465 |  |  |  | 1,812,334 |  |  |  | 3,198,837 |  |  |  | 3,692,452 |
Plastics |  |  | 1,127,455 |  |  |  | 1,035,705 |  |  |  | 2,294,683 |  |  |  | 2,174,302 |
Corporate |  |  | 2,801 |  |  |  | 26,242 |  |  |  | 2,801 |  |  |  | 51,772 |
|  | $ | 4,990,019 |  |  | $ | 5,018,292 |  |  | $ | 9,001,538 |  |  | $ | 8,655,528 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | June 30, 2023 |  |  | December 31, 2022 |
Cost incurred |  | $ | 4,018,416 |  |  | $ | 3,860,179 |
Unbilled project deliveries |  |  | 639,790 |  |  |  | 950,105 |
VAT |  |  | 448,695 |  |  |  | 229,006 |
Other receivables |  |  | 96,919 |  |  |  | 45,814 |
Prepayments |  |  | (3,620,906 | ) |  |  | (3,363,039 | )
Deferred Revenue |  |  | (54,713 | ) |  |  | (118,327 | )
|  | $ | 1,528,201 |  |  | $ | 1,603,738 |
Distributed as follows: |  |  |  |  |  |  |  |
Contract assets |  | $ | 2,406,402 |  |  | $ | 2,253,295 |
Contract liabilities |  |  | (878,201 | ) |  |  | (649,557 | )
|  | $ | 1,528,201 |  |  | $ | 1,603,738 |

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