Net Income Per Share (Tables)
 9 Months Ended
Dec. 31, 2012
Net Income Per Share [Abstract]  
Schedule Of Weighted Average Number Of Shares
Quarter Ended Dec. 31
2012 2011
Weighted average common shares outstanding – basic 4,847,619 4,807,859
Effect of dilutive securities:
Stock options
 22,594 58,502
Warrants
 1,806 7,068
Shares used in computing net income per share – diluted 4,872,019 4,873,429
Nine Months Ended Dec. 31
2012 2011
Weighted average common shares outstanding – basic 4,832,630 4,786,790
Effect of dilutive securities:
Stock options
 22,430 58,502
Warrants
 1,791 7,068
Shares used in computing net income per share – diluted 4,856,851 4,852,360