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Note 11 - Accounts Payable and Accrued Expenses (Tables)
3 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
   
June 30, 2019
   
March 31, 2019
 
Accounts payable
  $
4,088
    $
2,939
 
Accrued inventories in-transit
   
307
     
244
 
Accrued other miscellaneous expenses
   
1,794
     
1,759
 
Advanced deposits
   
745
     
631
 
Accrued compensation
   
3,678
     
5,404
 
Income taxes payable
   
3,601
     
3,363
 
Accrued warranty
   
1,606
     
1,545
 
Total
  $
15,819
    $
15,885
 
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended June 30,
 
   
2019
   
2018
 
Balance at beginning of period
  $
1,545
    $
1,769
 
Change in accruals for warranties during the period
   
85
     
104
 
Settlements during the period
   
(24
)    
(121
)
Balance at end of period
  $
1,606
    $
1,752