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Note 6 - Property and Equipment
3 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
6
. PROPERTY AND EQUIPMENT
 
Property and equipment consisted of the following:
 
   
December 31,
   
September 30,
 
   
2017
   
2017
 
Office furniture and equipment
  $
1,097,619
    $
1,093,502
 
Machinery and equipment
   
1,044,206
     
994,157
 
Leasehold improvements
   
76,138
     
76,138
 
Property and equipment, gross
   
2,217,963
     
2,163,797
 
Accumulated depreciation
   
(1,712,494
)    
(1,654,194
)
Property and equipment, net
  $
505,469
    $
509,603
 
 
 
   
Three months ended
 
   
December 31,
 
   
2017
   
2016
 
Depreciation expense
  $
58,301
    $
30,684