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Note 10 - Accrued Liabilities (Tables)
3 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
December 31,
   
September 30,
 
   
2018
   
2018
 
Payroll and related
  $
993,116
    $
2,041,735
 
Deferred revenue
   
342,649
     
460,086
 
Customer deposits
   
183,334
     
199,596
 
Accrued contract costs
   
295,551
     
197,034
 
Severance
   
73,679
     
152,730
 
Warranty reserve
   
115,045
     
99,216
 
Deferred rent
   
76,244
     
49,467
 
Total
  $
2,079,618
    $
3,199,864
 
Other Noncurrent Liabilities [Table Text Block]
   
December 31,
   
September 30,
 
   
2018
   
2018
 
Deferred rent
  $
1,832,884
    $
1,663,058
 
Deferred extended warranty revenue
   
83,255
     
76,372
 
Total
  $
1,916,139
    $
1,739,430
 
Schedule of Product Warranty Liability [Table Text Block]
   
December 31,
2018
   
September 30,
2018
 
Beginning balance
   
99,216
    $
104,518
 
Warranty provision
   
20,618
     
6,093
 
Warranty settlements
   
(4,789
)    
(11,395
)
Ending balance
  $
115,045
    $
99,216