Net Income Per Share (Tables)
 6 Months Ended
Sep. 30, 2012
Net Income Per Share [Abstract]  
Schedule Of Weighted Average Number Of Shares
Quarter Ended Sept. 30
2012 2011
Weighted average common shares outstanding – basic 4,825,441 4,776,198
Effect of dilutive securities:
Stock options
 57,363 113,011
Warrants
 1,852 7,316
Shares used in computing net income per share – diluted 4,884,656 4,896,525
Six Months Ended Sept. 30
2012 2011
Weighted average common shares outstanding – basic 4,825,095 4,776,198
Effect of dilutive securities:
Stock options
 55,646 113,011
Warrants
 1,783 7,316
Shares used in computing net income per share – diluted 4,882,524 4,896,525