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Note 11 - Accounts Payable and Accrued Expenses (Tables)
9 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
   
December 31, 2019
   
March 31, 2019
 
Accounts payable
  $
7,349
    $
2,939
 
Accrued inventories in-transit
   
894
     
244
 
Accrued other miscellaneous expenses
   
2,588
     
1,759
 
Advanced deposits
   
986
     
631
 
Accrued compensation
   
4,448
     
5,404
 
Income taxes payable
   
1,408
     
3,363
 
Accrued product warranty
   
1,706
     
1,545
 
Total
  $
19,379
    $
15,885
 
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended December 31,
   
Nine Months Ended December 31,
 
   
2019
   
2018
   
2019
   
2018
 
Balance at beginning of period
  $
1,641
    $
1,760
    $
1,545
    $
1,769
 
Change in accruals for warranties during the period
   
93
     
260
     
247
     
577
 
Settlements during the period
   
(28
)    
(524
)    
(86
)    
(850
)
Balance at end of period
  $
1,706
    $
1,496
    $
1,706
    $
1,496