Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance Beginning at Mar. 31, 2011	$ 607,821	$ 6,238,498	$ 19,394,295	$ 26,240,614
Balance Beginning (in Shares) at Mar. 31, 2011	2,431,286
Net income			760,872	760,872
Cash dividend			(611,571)	(611,571)
Exercise of stock options	3,750	120,600		124,350
Exercise of stock options (in Shares)	15,000
Compensation expense related to stock options		1,469		1,469
Balance Ending at Sep. 30, 2011	611,571	6,360,567	19,543,596	26,515,734
Balance Ending (in Shares) at Sep. 30, 2011	2,446,286
Balance Beginning at Mar. 31, 2012	611,571	6,308,411	20,132,948	27,052,930
Balance Beginning (in Shares) at Mar. 31, 2012	2,446,286
Net income			644,445	644,445
Cash dividend			(611,571)	(611,571)
Compensation expense related to stock options		1,000		1,000
Balance Ending at Sep. 30, 2012	$ 611,571	$ 6,309,411	$ 20,165,822	$ 27,086,804
Balance Ending (in Shares) at Sep. 30, 2012	2,446,286