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Note 6 - Inventories (Tables)
9 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

June 30, 2021

  

September 30, 2020

 

Raw materials

 $16,881,148  $12,287,134 

Work-in-process

  2,866,264   1,033,021 

Finished goods

  2,373,251   2,048,514 

Inventories, gross

  22,120,663   15,368,669 

Inventory reserve

  (1,141,524)  (960,131)

Inventories, net

 $20,979,139  $14,408,538