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Note 6 - Inventories (Tables)
 12 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
  
   
2018
    
2017
  
Raw materials
   $
4,487,273
     $
3,784,935
  
Finished goods
    
1,768,544
      
1,742,960
  
Work in process
    
875,417
      
147,871
  
Inventories, gross
    
7,131,234
      
5,675,766
  
Reserve for obsolescence
    
(397,051
 )    
(418,532
 )
Inventories, net
   $
6,734,183
     $
5,257,234