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Note 8 - Property and Equipment (Tables)
6 Months Ended
Mar. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
   
September 30,
 
   
2018
   
2017
 
Office furniture and equipment
  $
1,296,249
    $
1,093,502
 
Machinery and equipment
   
1,067,802
     
994,157
 
Leasehold improvements
   
76,138
     
76,138
 
Property and equipment, gross
   
2,440,189
     
2,163,797
 
Accumulated depreciation
   
(1,956,722
)    
(1,654,194
)
Property and equipment, net
  $
483,467
    $
509,603
 
Depreciation Expense [Member]  
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Six months ended
 
   
March 31,
 
   
2018
   
2017
 
Depreciation expense
  $
121,967
    $
59,153