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			138,511		138,511
Cash dividend ($0.30 per share)			(733,885)		(733,885)
Compensation expense related to stock options		5,657			5,657
Balance, June 30, at Jun. 30, 2013	611,571	6,327,068	20,595,863		27,534,502
Balance, June 30, (in Shares) at Jun. 30, 2013	2,446,286
Balance, March 31, at Mar. 31, 2014	588,756	4,855,093	21,923,988	(7,780)	27,360,057
Balance, March 31, (in Shares) at Mar. 31, 2014	2,355,028
Net income			72,797		72,797
Unrealized loss from marketable securities, net of tax				(51,543)	(51,543)
Repurchase of stock options		(47,160)			(47,160)
Compensation expense related to stock options		5,375			5,375
Balance, June 30, at Jun. 30, 2014	$ 588,756	$ 4,813,308	$ 21,996,785	$ (59,323)	$ 27,339,526
Balance, June 30, (in Shares) at Jun. 30, 2014	2,355,028