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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | 2019 |  |  | 2018 |
Allowance for doubtful accounts at the beginning of the period |  | $ | 971,772 |  |  | $ | 660,581 |
Bad debt expense |  |  | 25,044 |  |  |  | 353,562 |
Receivables written off during the periods |  |  | (362,244 | ) |  |  | - |
Effect of currency translation |  |  | (22,138 | ) |  |  | (42,371 | )
Allowance for doubtful accounts at the end of the period |  | $ | 612,434 |  |  | $ | 971,772 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | For the Year Ended December 31 |
|  | 2019 |  |  | 2018 |
United States and Canada |  | $ | 1,600,298 |  |  | $ | 922,245 |
Australia |  |  | 425,560 |  |  |  | 597,214 |
South America |  |  | - |  |  |  | 49,861 |
Asia |  |  | 5,991,440 |  |  |  | 1,369,735 |
Europe |  |  | 24,620,186 |  |  |  | 9,293,033 |
|  | $ | 32,637,484 |  |  | $ | 12,232,088 |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | For the Year Ended December 31 |
|  | 2019 |  |  | 2018 |
Ceramic diesel particulate |  | $ | 5,652,686 |  |  | $ | 6,536,085 |
Liquid filters and systems |  |  | 25,464,614 |  |  |  | 5,264,663 |
Plastics |  |  | 895,203 |  |  |  | - |
Development projects |  |  | 625,981 |  |  |  | 431,340 |
|  | $ | 32,637,484 |  |  | $ | 12,232,088 |
Contract with Customer, Asset and Liability [Table Text Block] |
|  | 2019 |  |  | 2018 |
Cost incurred |  | $ | 3,960,199 |  |  | $ | 2,066,982 |
Prepayments |  |  | (1,732,231 | ) |  |  | (1,959,042 | )
Deferred Revenue |  |  | (876,286 | ) |  |  | (98,781 | )
Allowance for doubtful accounts at the end of the period |  | $ | 1,351,682 |  |  | $ | 9,159 |
Distributed as follows: |  |  |  |  |  |  |  |
Contract Assets |  |  | 2,773,058 |  |  |  | 624,275 |
Contract Liabilities |  |  | (1,421,376 | ) |  |  | (615,116 | )
|  |  | 1,351,682 |  |  |  | 9,159 |

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