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Note 7 - Property and Equipment (Tables)
12 Months Ended
Sep. 30, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September 30,
 
   
2018
   
2017
 
Office furniture and equipment
  $
1,326,784
    $
1,093,502
 
Machinery and equipment
   
1,095,099
     
994,157
 
Leasehold improvements
   
-
     
76,138
 
Construction in progress
   
2,001,539
     
-
 
Property and equipment, gross
   
4,423,422
     
2,163,797
 
Accumulated depreciation
   
(1,974,697
)    
(1,654,194
)
Property and equipment, net
  $
2,448,725
    $
509,603
 
Depreciation Expense [Member]  
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Year Ended September 30,
 
   
2018
   
2017
 
Depreciation expense
  $
251,186
    $
146,067