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Note 18 - Major Customers (Tables)
9 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Three months ended June 30,
   
Nine months ended June 30,
 
   
2019
   
2018
   
2019
   
2018
 
Americas
  $
5,661,496
    $
3,814,782
    $
23,430,521
    $
14,918,891
 
Asia Pacific
   
2,681,229
     
3,089,770
     
3,827,716
     
6,367,532
 
Europe, Middle East and Africa
   
521,001
     
609,516
     
1,974,739
     
1,724,659
 
Total Revenues
  $
8,863,726
    $
7,514,068
    $
29,232,976
    $
23,011,082