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Note 7 - Inventories (Tables)
 6 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
    
September 30,
  
   
2018
    
2017
  
Raw materials
   $
5,135,966
     $
3,784,935
  
Finished goods
    
417,587
      
1,742,960
  
Work in process
    
393,756
      
147,871
  
Inventories, gross
    
5,947,309
      
5,675,766
  
Reserve for obsolescence
    
(503,967
 )    
(418,532
 )
Inventories, net
   $
5,443,342
     $
5,257,234