Net Income Per Share (Details)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income Per Share [Abstract]
Weighted average common shares outstanding - basic	4,855,071	4,852,178	4,853,068	4,857,279
Stock options	16,958	20,435	15,701	20,798
Warrants		493		522
Shares used in computing net income per share - diluted	4,872,029	4,873,106	4,868,769	4,878,599
Stock options and warrants not included in computation of diluted earnings per share	4,000		4,000	13,000