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Note 11 - Accounts Payable and Accrued Expenses (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
   
March 31, 2021
   
March 31, 2020
 
Accounts payable
  $
5,353
    $
10,045
 
Accrued inventories in-transit
   
1,460
     
763
 
Accrued other miscellaneous expenses
   
2,369
     
1,986
 
Advanced deposits    
1,035
     
666
 
Accrued compensation
   
7,018
     
5,683
 
Income taxes payable
   
522
     
933
 
Accrued product warranty
   
2,053
     
2,015
 
Total
  $
19,810
    $
22,091
 
Schedule of Product Warranty Liability [Table Text Block]
   
Fiscal Years Ended March 31,
 
   
2021
   
2020
 
Balance at beginning of period
  $
2,015
    $
1,545
 
Acquired Warranty Obligation    
147
     
 
Change in accruals for warranties during the period
   
643
     
542
 
Settlements during the period
   
(752
)    
(72
)
Balance at end of period
  $
2,053
    $
2,015