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Note 5 - Inventories (Tables)
 12 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
  
   
2017
    
2016
  
Raw materials
   $
3,784,935
     $
4,393,928
  
Finished goods
    
1,742,960
      
775,628
  
Work in process
    
147,871
      
174,485
  
Inventories, gross
    
5,675,766
      
5,344,041
  
Reserve for obsolescence
    
(418,532
 )    
(580,132
 )
Inventories, net
   $
5,257,234
     $
4,763,909