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Note 11 - Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
 
Foreign
Currency
 
 
Unrealized
Gains (Losses)
on Securities
 
 
Defined Benefit
Pension Plans
 
 
Accumulated Other Comprehensive
(Loss)
 
Balance as of March 31, 2014
   $
10,535
     $
325
     $
(5,831
 )   $
5,029
  
Other comprehensive income (loss)
before reclassifications
    
(24,112
 )    
(1,536
 )    
(3,830
 )    
(29,478
 )
Net gain (loss) reclassified from
accumulated other
comprehensive income (loss)
    
-
      
1,218
      
143
      
1,361
  
Net current period other
comprehensive income (loss)
    
(24,112
 )    
(318
 )    
(3,687
 )    
(28,117
 )
Balance as of March 31, 2015
    
(13,577
 )    
7
      
(9,518
 )    
(23,088
 )
Other comprehensive income (loss)
before reclassifications
    
2,938
      
(362
 )    
(71
 )    
2,505
  
Net gain (loss) reclassified from
accumulated other
comprehensive income (loss)
    
-
      
273
      
44
      
317
  
Net current period other
comprehensive income (loss)
    
2,938
      
(89
 )    
(27
 )    
2,822
  
Balance as of March 31, 2016
    
(10,639
 )    
(82
 )    
(9,545
 )    
(20,266
 )
Other comprehensive income (loss)
before reclassifications
    
(8,594
 )    
(106
 )    
196
      
(8,504
 )
Net gain (loss) reclassified from
accumulated other
comprehensive income (loss)
    
-
      
(31
 )    
256
      
225
  
Net current period other
comprehensive income (loss)
    
(8,594
 )    
(137
 )    
452
      
(8,279
 )
Balance as of March 31, 2017
   $
(19,233
 )   $
(219
 )   $
(9,093
 )   $
(28,545
 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Accumulated Other
Comprehensive Income (Loss)
Components
 
Amount Reclassified from Accumulated
Other Comprehensive Income (Loss)
 
Impacted Line Item on Consolidated
Statements of Operations
 
 
Year Ended March 31,
 
 
 
 
2017
 
 
2016
 
 
2015
 
 
                           
Net gain (loss) on investments
   $
201
     $
(1
 )   $
30
  
Other income (expense), net
Impairment of marketable securities
    
(151
 )    
(454
 )    
(1,903
 )
Other income (expense), net
Recognized actuarial loss
    
(387
 )    
(437
 )    
(179
 )
Cost of goods sold
Subtotal
    
(337
 )    
(892
 )    
(2,052
 )
Income before income tax provision
Tax impact
    
112
      
575
      
691
  
Provision for income tax
Total reclassifications for the year
   $
(225
 )   $
(317
 )   $
(1,361
 )
Net income