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Note 11 - Accrued Liabilities (Tables)
3 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
December 31,
   
September 30,
 
   
2020
   
2020
 
Payroll and related
  $
1,343
    $
2,545
 
Deferred revenue
   
576
     
731
 
Customer deposits
   
4,938
     
3,683
 
Accrued contract costs
   
857
     
719
 
Warranty reserve
   
134
     
126
 
Other    
-
     
76
 
Total
  $
7,848
    $
7,880
 
Other Noncurrent Liabilities [Table Text Block]
   
December 31,
   
September 30,
 
   
2020
   
2020
 
Deferred extended warranty revenue
  $
275
    $
293
 
Asset purchase holdback liability
   
640
     
-
 
Total
  $
915
    $
293
 
Schedule of Product Warranty Liability [Table Text Block]
   
December 31,
   
September 30,
 
   
2020
   
2020
 
Beginning balance
  $
126
    $
150
 
Warranty provision
   
15
     
16
 
Warranty settlements
   
(7
)    
(40
)
Ending balance
  $
134
    $
126