Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance, March 31, at Mar. 31, 2013	$ 611,571	$ 6,321,411	$ 21,191,237		$ 28,124,219
Balance, March 31, (in Shares) at Mar. 31, 2013	2,446,286
Net income			594,621		594,621
Cash dividend ($0.30 per share)			(733,885)		(733,885)
Compensation expense related to stock options		12,449			12,449
Balance, June 30, at Sep. 30, 2013	611,571	6,333,860	21,051,973		27,997,404
Balance, June 30, (in Shares) at Sep. 30, 2013	2,446,286
Balance, March 31, at Mar. 31, 2014	588,756	4,855,093	21,923,989	(7,780)	27,360,057
Balance, March 31, (in Shares) at Mar. 31, 2014	2,355,028
Net income			1,891,103		1,891,103
Repurchase of stock options		(112,935)			(112,935)
Compensation expense related to stock options		8,958			8,958
Unrealized loss from marketable securities				(82,687)	(82,687)
Balance, June 30, at Sep. 30, 2014	$ 588,756	$ 4,751,116	$ 23,815,092	$ (90,467)	$ 29,064,497
Balance, June 30, (in Shares) at Sep. 30, 2014	2,355,028