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Note 6 - Inventories (Tables)
 6 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
    
September 30,
  
   
2019
    
2018
  
Raw materials
   $
6,079,243
     $
4,487,273
  
Finished goods
    
1,969,021
      
1,768,544
  
Work in process
    
789,889
      
875,417
  
Inventories, gross
    
8,838,153
      
7,131,234
  
Reserve for obsolescence
    
(532,310
 )    
(397,051
 )
Inventories, net
   $
8,305,843
     $
6,734,183