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Note 7 - Inventories (Tables)
 9 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30,
2018
    
September 30,
2017
  
Raw materials
   $
5,119,720
     $
3,784,935
  
Finished goods
    
456,899
      
1,742,960
  
Work in progress
    
338,506
      
147,871
  
Inventories, gross
    
5,915,125
      
5,675,766
  
Reserve for obsolescence
    
(510,507
 )    
(418,532
 )
Inventories, net
   $
5,404,618
     $
5,257,234