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Note 6 - Inventories (Tables)
9 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    June 30, 2018   September 30, 2017
Raw materials   $
5,136,429
    $
5,991,863
 
Work-in-progress    
773,652
     
724,248
 
Finished goods    
3,777,971
     
1,737,456
 
Inventories, net   $
9,688,052
    $
8,453,567