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Note 18 - Major Customers (Tables)
6 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Three months ended March 31,
   
Six months ended March 31,
 
   
2019
   
2018
   
2019
   
2018
 
Americas
  $
9,048,167
    $
5,051,072
    $
17,769,488
    $
11,104,110
 
Asia Pacific
   
506,968
     
2,255,856
     
1,146,024
     
3,277,762
 
Europe, Middle East and Africa
   
636,556
     
561,520
     
1,453,738
     
1,115,143
 
Total Revenues
  $
10,191,691
    $
7,868,448
    $
20,369,250
    $
15,497,015