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Note 8 - Significant Customers / Concentration / Disaggregated Revenue (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
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,
 
   
2019
   
2018
   
2019
   
2018
 
United States and Canada
  $
255,642
    $
260,525
    $
688,229
    $
369,750
 
Australia
   
153,401
     
82,490
     
215,514
     
282,793
 
South America
   
-
     
24,248
     
-
     
27,676
 
Asia
   
933,693
     
111,015
     
2,172,807
     
928,616
 
Europe
   
7,954,450
     
3,119,750
     
13,641,834
     
4,380,575
 
    $
9,297,186
    $
3,598,028
    $
16,718,384
    $
5,989,410
 
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
   
For the Three Months
   
For the Six Months
 
   
Ended June 30,
   
Ended June 30,
 
   
2019
   
2018
   
2019
   
2018
 
Ceramic diesel particulate
  $
747,234
    $
1,609,057
    $
2,990,502
    $
3,537,162
 
Liquid filters and systems
   
8,453,136
     
1,988,971
     
13,493,469
     
2,452,248
 
Development projects
   
96,815
     
-
     
234,413
     
-
 
    $
9,297,186
    $
3,598,028
    $
16,718,384
    $
5,989,410