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Note 1 - Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | June 30, 2020 |  |  | December 31, 2019 |
Allowance for doubtful accounts at the beginning of the period |  | $ | 612,434 |  |  | $ | 971,772 |
Bad debt expense |  |  | 327 |  |  |  | 25,044 |
Receivables written off during the periods |  |  | (459,207 | ) |  |  | (362,244 | )
Effect of currency translation |  |  | (6,305 | ) |  |  | (22,138 | )
Allowance for doubtful accounts at the end of the period |  | $ | 147,250 |  |  | $ | 612,434 |
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, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
United States and Canada |  | $ | 307,480 |  |  | $ | 255,642 |  |  | $ | 433,962 |  |  | $ | 688,229 |
Australia |  |  | 61,706 |  |  |  | 153,401 |  |  |  | 103,961 |  |  |  | 215,514 |
South America |  |  | 12,043 |  |  |  | - |  |  |  | 22,939 |  |  |  | - |
Asia |  |  | 292,756 |  |  |  | 933,693 |  |  |  | 2,326,044 |  |  |  | 2,172,807 |
Europe |  |  | 3,967,498 |  |  |  | 7,954,450 |  |  |  | 12,036,421 |  |  |  | 13,641,834 |
|  | $ | 4,641,483 |  |  | $ | 9,297,186 |  |  | $ | 14,923,327 |  |  | $ | 16,718,384 |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | For the Three Months |  |  | For the Six Months |
|  | Ended June 30, |  |  | Ended June 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Liquid filters and systems |  | $ | 2,551,710 |  |  | $ | 8,453,136 |  |  | $ | 10,531,998 |  |  | $ | 13,493,469 |
Diesel particulate filters |  |  | 1,160,695 |  |  |  | 747,234 |  |  |  | 2,720,757 |  |  |  | 2,990,502 |
Plastic components |  |  | 762,384 |  |  |  | - |  |  |  | 1,343,794 |  |  |  | - |
Development projects |  |  | 166,694 |  |  |  | 96,815 |  |  |  | 326,778 |  |  |  | 234,413 |
|  | $ | 4,641,483 |  |  | $ | 9,297,186 |  |  | $ | 14,923,327 |  |  | $ | 16,718,384 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | June 30, 2020 |  |  | December 31, 2019 |
Cost incurred |  | $ | 4,305,503 |  |  | $ | 3,960,199 |
Unbilled project deliveries |  |  | 1,805,884 |  |  |  | 1,971,106 |
VAT |  |  | 397,949 |  |  |  | 862,368 |
Other receivables |  |  | 114,036 |  |  |  | 58,397 |
Prepayments |  |  | (2,330,373 | ) |  |  | (1,732,231 | )
Deferred Revenue |  |  | (1,093,114 | ) |  |  | (876,286 | )
|  | $ | 3,199,885 |  |  | $ | 4,243,553 |
Distributed as follows: |  |  |  |  |  |  |  |
Contract assets |  | $ | 4,523,130 |  |  | $ | 5,664,929 |
Contract liabilities |  |  | (1,323,245 | ) |  |  | (1,421,376 | )
|  | $ | 3,199,885 |  |  | $ | 4,243,553 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Fair value at reporting date using: |
|  | June 30, 2020 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Contingent Earn-out Liability |  | $ | 901,537 |  |  | $ | - |  |  | $ | - |  |  | $ | 901,537 |
Prefunded warrants |  |  | 2,811,900 |  |  |  | 2,811,900 |  |  |  | - |  |  |  | - |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
Balance at December 31, 2019 |  | $ | 898,755 |
Foreign currency effect |  |  | 2,782 |
Balance at June 30, 2020 |  | $ | 901,537 |
Schedule of Stockholders' Equity Note, Warrants or Rights Activity [Table Text Block] |
Base value of warrants, 515,000 warrants at $5 |  | $ | 2,575,000 |
Fair value adjustment |  |  | 236,900 |
Balance at June 30, 2020 |  | $ | 2,811,900 |

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