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Note 11 - Accrued Liabilities (Tables)
6 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
March 31,
   
September 30,
 
   
2021
   
2020
 
Payroll and related
  $
2,054
    $
2,545
 
Deferred revenue
   
620
     
731
 
Customer deposits
   
3,169
     
3,683
 
Accrued contract costs
   
1,007
     
719
 
Warranty reserve
   
144
     
126
 
Other
   
-
     
76
 
Total
  $
6,994
    $
7,880
 
Other Noncurrent Liabilities [Table Text Block]
   
March 31,
   
September 30,
 
   
2021
   
2020
 
Deferred extended warranty revenue
  $
214
    $
293
 
Asset purchase holdback liability
   
670
     
-
 
Total
  $
884
    $
293
 
Schedule of Product Warranty Liability [Table Text Block]
   
March 31,
   
September 30,
 
   
2021
   
2020
 
Beginning balance
  $
126
    $
150
 
Warranty provision
   
37
     
16
 
Warranty settlements
   
(19
)    
(40
)
Ending balance
  $
144
    $
126