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Note 7 - Property and Equipment (Tables)
 6 Months Ended
Mar. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
    
September 30,
  
   
2019
    
2018
  
Office furniture and equipment
   $
1,483,577
     $
1,326,784
  
Machinery and equipment
    
1,224,183
      
1,095,099
  
Leasehold improvements
    
1,997,927
      
-
  
Construction in progress
    
10,957
      
2,001,539
  
Property and equipment, gross
    
4,716,644
      
4,423,422
  
Accumulated depreciation
    
(2,232,535
 )    
(1,974,697
 )
Property and equipment, net
   $
2,484,109
     $
2,448,725
  
Depreciation Expense [Member]  
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Three months ended March 31,
   
Six months ended March 31,
 
   
2019
    
2018
    
2019
    
2018
  
Depreciation expense
   $
139,737
     $
63,666
     $
264,197
     $
121,967