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Note 7 - Property and Equipment (Tables)
 9 Months Ended
Jun. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
June 30,
    
September 30,
  
   
2019
    
2018
  
Office furniture and equipment
   $
1,313,273
     $
1,326,784
  
Machinery and equipment
    
1,223,726
      
1,095,099
  
Leasehold improvements
    
2,000,951
      
-
  
Construction in progress
    
7,207
      
2,001,539
  
Property and equipment, gross
    
4,545,157
      
4,423,422
  
Accumulated depreciation
    
(2,187,294
 )    
(1,974,697
 )
Property and equipment, net
   $
2,357,863
     $
2,448,725
  
Depreciation Expense [Member]  
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Three months ended June 30,
   
Nine months ended June 30,
 
   
2019
    
2018
    
2019
    
2018
  
Depreciation expense
   $
150,327
     $
62,207
     $
394,524
     $
184,174