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Note 10 - Accrued Liabilities (Tables)
6 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
March 31,
   
September 30,
 
   
2019
   
2018
 
Payroll and related
  $
1,484,278
    $
2,041,735
 
Deferred revenue
   
456,857
     
460,086
 
Customer deposits
   
732,517
     
199,596
 
Accrued contract costs
   
439,068
     
197,034
 
Severance
   
-
     
152,730
 
Warranty reserve
   
125,175
     
99,216
 
Deferred rent
   
96,264
     
49,467
 
Total
  $
3,334,159
    $
3,199,864
 
Other Noncurrent Liabilities [Table Text Block]
   
March 31,
   
September 30,
 
   
2019
   
2018
 
Deferred rent
  $
1,937,175
    $
1,663,058
 
Deferred extended warranty revenue
   
146,043
     
76,372
 
Total
  $
2,083,218
    $
1,739,430
 
Schedule of Product Warranty Liability [Table Text Block]
   
March 31,
   
September 30,
 
   
2019
   
2018
 
Beginning balance
  $
99,216
    $
104,518
 
Warranty provision
   
44,037
     
6,093
 
Warranty settlements
   
(18,078
)    
(11,395
)
Ending balance
  $
125,175
    $
99,216