Consolidated Statements of Stockholders' Equity (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Mar. 31, 2012	$ 611,571	$ 6,308,411	$ 20,132,948		$ 27,052,930
Balance (in Shares) at Mar. 31, 2012	2,446,286
Net income			1,669,860		1,669,860
Cash dividend			(611,571)		(611,571)
Compensation expense related to stock options		13,000			13,000
Balance at Mar. 31, 2013	611,571	6,321,411	21,191,237		28,124,219
Balance (in Shares) at Mar. 31, 2013	2,446,286
Net income			1,466,636		1,466,636
Unrealized loss from marketable securities, net of tax				(7,780)	(7,780)
Cash dividend			(733,885)		(733,885)
Exercise of stock options	625	24,750			25,375
Exercise of stock options (in Shares)	2,500				2,500
Repurchase of stock options		(394,490)			(394,490)
Repurchase of common stock	(23,440)	(1,054,776)			(1,078,216)
Repurchase of common stock (in Shares)	(93,758)
Tax effect from exercise, forfeiture and repurchase of stock options		(65,000)			(65,000)
Compensation expense related to stock options		23,198			23,198
Balance at Mar. 31, 2014	$ 588,756	$ 4,855,093	$ 21,923,988	$ (7,780)	$ 27,360,057
Balance (in Shares) at Mar. 31, 2014	2,355,028