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Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount $ 11,967 $ 12,183
Intangible assets, Accumulated Amortization (9,218) (8,411)
Intangible assets, Net Book Value 2,749 3,772
Licenses [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount 5,349 5,360
Intangible assets, Accumulated Amortization (3,366) (2,689)
Intangible assets, Net Book Value 1,983 2,671
Intangible assets, Estimated Useful Life 7 years  
Trade Names And Trademarks [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount 1,165 1,212
Intangible assets, Accumulated Amortization (1,040) (909)
Intangible assets, Net Book Value 125 303
Intangible assets, Estimated Useful Life 7 years  
Core Technology And Know How [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount 5,453 5,611
Intangible assets, Accumulated Amortization (4,812) (4,813)
Intangible assets, Net Book Value $ 641 $ 798
Minimum [Member] | Core Technology And Know How [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Estimated Useful Life 5 years  
Maximum [Member] | Core Technology And Know How [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Estimated Useful Life 10 years