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Note 6 - Property and Equipment (Tables)
6 Months Ended
Mar. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
 
 
March 31,
 
 
September 30,
 
 
 
2017
 
 
2016
 
Machinery and equipment
  $
967,526
    $
957,829
 
Office furniture and equipment
   
1,018,244
     
976,856
 
Leasehold improvements
   
76,138
     
71,738
 
Property and equipment, gross
   
2,061,908
     
2,006,423
 
Accumulated depreciation
   
(1,590,244
)    
(1,533,079
)
Property and equipment, net
  $
471,664
    $
473,344
 
Depreciation Expense [Member]  
Notes Tables  
Property, Plant and Equipment [Table Text Block]
 
 
Six months ended
 
 
 
March 31,
 
 
 
2017
 
 
2016
 
Depreciation expense
  $
59,153
    $
94,251