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Note 6 - Inventories (Tables)
 6 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
    
September 30,
  
   
2020
    
2019
  
Raw materials
   $
5,591,252
     $
5,060,331
  
Finished goods
    
920,663
      
998,607
  
Work in process
    
1,068,097
      
306,809
  
Inventories, gross
    
7,580,012
      
6,365,747
  
Reserve for obsolescence
    
(658,183
 )    
(530,584
 )
Inventories, net
   $
6,921,829
     $
5,835,163