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Note 17 - Major Customers (Tables)
6 Months Ended
Mar. 31, 2018
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,
 
   
2018
   
2017
   
2018
   
2017
 
Americas
  $
5,051,072
    $
2,099,151
    $
11,104,110
    $
3,721,509
 
Asia Pacific
   
2,255,856
     
2,923,825
     
3,277,762
     
3,908,425
 
Europe, Middle East and Africa
   
561,520
     
719,415
     
1,115,143
     
1,053,792
 
Total Revenues
  $
7,868,448
    $
5,742,391
    $
15,497,015
    $
8,683,726