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Note 11 Accumulated Other Comprehensive Income (Loss) (Tables)
12 Months Ended
Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 The components and the changes in accumulated other comprehensive income (loss), net of tax, were as follows (in thousands):
                
     Foreign Currency Unrealized Gains (Losses) on Securities Defined Benefit Pension Plans Accumulated Other Comprehensive Income (Loss)
 Balance as of March 31, 2012 $ 6,472 $ (68) $ (4,314) $ 2,090
  Other comprehensive income            
   before reclassifications   (3,490)   (672)   (1,957)   (6,119)
  Net loss reclassified from            
   accumulated other             
   comprehensive income   -   800   136   936
  Net current period other            
   comprehensive income   (3,490)   128   (1,821)   (5,183)
 Balance as of March 31, 2013   2,982   60   (6,135)   (3,093)
  Other comprehensive loss            
   before reclassifications   7,553   361   89   8,003
  Net loss (gain) reclassified from            
   accumulated other             
   comprehensive income   -   (96)   215   119
  Net current period other            
   comprehensive income   7,553   265   304   8,122
 Balance as of March 31, 2014 $ 10,535 $ 325 $ (5,831) $ 5,029
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The amounts reclassified out of accumulated other comprehensive income (loss) for the fiscal year 2014, 2013 and 2012 are as follows (in thousands):
            
  Year Ended March 31,   
  2014 2013 2012  
Accumulated Other Comprehensive Income Components Amount Reclassified from Accumulated Other Comprehensive Income  Impacted Line Item on Consolidated Statements of Operations
            
Net gain on investments $155 $ 111 $ 49 Other income (expense), net
Impairment of marketable securities   (7)   (1,342)   - Other income (expense), net
Recognized actuarial gain (loss)   (236)   (167)   (70) Cost of goods sold
Subtotal   (88)   (1,398)   (21) Income before income tax provision
Tax impact   (31)   462   (1) Provision for income tax
Total reclassifications for the period $ (119) $ (936) $ (22) Net income