Stock-Based Compensation (Tables)
 12 Months Ended
Mar. 31, 2013
Stock-Based Compensation [Abstract]  
Schedule Of Valuation Assumptions
Year Ended March 31
2013 2012 2011
Risk-free interest rate 0.7 % 1.0 % 1.6 %
Expected volatility 38 % 42 % 56 %
Expected life (years) 4.1   4.1   4.2  
Dividend yield 0 % 0 % 0 %
Summary Of Options Outstanding
Ranges of
Exercise Prices		      Number
Outstanding		      Weighted Average
Exercise Price		      Weighted Remaining
Contractual Life (years)
$  15.08 - 16.33 27,000 $ 16.24 2.8
31.27 - 42.45 9,000 37.00 6.0
51.04 - 58.27 13,000 54.76 7.5
49,000 $ 30.27 4.6
Summary Of Stock Options And Warrants
Option Shares
Reserved		       Options
Outstanding		       Weighted Average
Option Exercise Price		       Warrants
Outstanding		       Weighted Average
Warrant Exercise Price
At March 31, 2010     170,230     254,500     $ 17.28   10,000     $ 16.28
Granted
 (4,000 ) 4,000 $ 42.45 - -
Exercised
 -   (83,500 ) $ 9.56 -   -
At March 31, 2011     166,230   175,000   $ 21.54 10,000   $ 16.28
Granted
 (4,000 ) 4,000 $ 58.25 -       -
Exercised
 -   (70,000 ) $ 16.93 -     -
At March 31, 2012    162,230   109,000   $ 25.85 10,000   $ 16.28
Granted
 (4,000 ) 4,000 $ 54.11 - -
Exercised
 -   (64,000 ) $ 24.23 - -
Terminated
 -   -   $ - (6,000 )     7.35
At March 31, 2013    158,230   49,000   $ 30.27 4,000   $ 29.69