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Note 6 - Property and Equipment (Tables)
6 Months Ended
Mar. 31, 2016
Notes Tables  
Property, Plant and Equipment [Table Text Block]
 
 
March 31,
2016
 
 
September 30,
2015
 
Machinery and equipment
  $ 956,759     $ 940,289  
Office furniture and equipment
    968,655       877,011  
Leasehold improvements
    71,738       67,913  
Property and equipment, gross
    1,997,152       1,885,213  
Accumulated depreciation
    (1,492,846 )     (1,413,250 )
Property and equipment, net
  $ 504,306     $ 471,963  
 
 
Six months ended
March 31,
 
 
 
2016
 
 
2015
 
Depreciation expense
  $ 94,251     $ 117,176