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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Allowance for Accounts Receivable Ship and Debit [Table Text Block]
Balance March 31, 2014
   $
1,071
  
Additions
    
5,765
  
Deductions
    
(5,777
 )
Balance March 31, 2015
    
1,059
  
Additions
    
4,479
  
Deductions
    
(4,672
 )
Balance March 31, 2016
    
866
  
Additions
    
7,363
  
Deductions
    
(6,680
 )
Balance March 31, 2017
   $
1,549
  
Schedule of Excess Inventory Reserve [Table Text Block]
Balance at March 31, 2014
   $
24,304
  
Utilization or sale
    
(1,637
 )
Scrap
    
(2,901
 )
Additional provision
    
4,487
  
Foreign currency translation adjustments
    
(1,500
 )
Balance at March 31, 2015
    
22,753
  
Utilization or sale
    
(2,455
 )
Scrap
    
(3,217
 )
Additional provision
    
4,125
  
Foreign currency translation adjustments
    
174
  
Balance at March 31, 2016
    
21,380
  
Utilization or sale
    
(3,813
 )
Scrap
    
(3,682
 )
Additional provision
    
5,838
  
Foreign currency translation adjustments
    
(425
 )
Balance at March 31, 2017
   $
19,298