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Note 10 - Accounts Payable and Accrued Expenses (Tables)
3 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
   
June 30, 2020
   
March 31, 2020
 
Accounts payable
  $
3,539
    $
10,045
 
Accrued inventories in-transit
   
1,201
     
763
 
Accrued other miscellaneous expenses
   
2,342
     
1,986
 
Advanced deposits
   
665
     
666
 
Accrued compensation
   
3,404
     
5,683
 
Income taxes payable
   
946
     
933
 
Accrued product warranty
   
2,168
     
2,015
 
Total
  $
14,265
    $
22,091
 
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended June 30,
 
   
2020
   
2019
 
Balance at beginning of period
  $
2,015
    $
1,545
 
Change in accruals for warranties during the period
   
236
     
85
 
Settlements during the period
   
(83
)    
(24
)
Balance at end of period
  $
2,168
    $
1,606