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Note 3 - Inventory (Tables)
 3 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
  
December 31,
2016
    
September 30,
2016
  
                 
Raw materials and component parts
  $
1,719,027
     $
1,730,563
  
Work-in-process
   
446,961
      
438,447
  
Finished products
   
1,053,805
      
1,139,789
  
                 
    $
3,219,793
     $
3,308,799