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			1,339,600	1,339,600
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 Dec. 31, 2011	611,571	6,360,567	20,122,324	27,094,462
Balance Ending (in Shares) at Dec. 31, 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			1,277,205	1,277,205
Cash dividend			(611,571)	(611,571)
Compensation expense related to stock options		7,000		7,000
Balance Ending at Dec. 31, 2012	$ 611,571	$ 6,315,411	$ 20,798,582	$ 27,725,564
Balance Ending (in Shares) at Dec. 31, 2012	2,446,286