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Note 11 - Accounts Payable and Accrued Expenses (Tables)
6 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
   
September 30, 2019
   
March 31, 2019
 
Accounts payable
  $
6,164
    $
2,939
 
Accrued inventories in-transit
   
603
     
244
 
Accrued other miscellaneous expenses
   
1,772
     
1,759
 
Advanced deposits
   
1,771
     
631
 
Accrued compensation
   
3,730
     
5,404
 
Income taxes payable
   
3,043
     
3,363
 
Accrued product warranty
   
1,641
     
1,545
 
Total
  $
18,724
    $
15,885
 
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended September 30,
   
Six Months Ended September 30,
 
   
2019
   
2018
   
2019
   
2018
 
Balance at beginning of period
  $
1,606
    $
1,752
    $
1,545
    $
1,769
 
Change in accruals for warranties during the period
   
71
     
213
     
156
     
317
 
Settlements during the period
   
(36
)    
(205
)    
(60
)    
(326
)
Balance at end of period
  $
1,641
    $
1,760
    $
1,641
    $
1,760