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Note 6 - Inventories (Tables)
 9 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30,
    
September 30,
  
   
2019
    
2018
  
Raw materials
   $
5,405,868
     $
4,487,273
  
Finished goods
    
1,235,468
      
1,768,544
  
Work in process
    
289,592
      
875,417
  
Inventories, gross
    
6,930,928
      
7,131,234
  
Reserve for obsolescence
    
(518,086
 )    
(397,051
 )
Inventories, net
   $
6,412,842
     $
6,734,183