Consolidated Statements of Stockholders' Equity (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Balance	$ 28,124,219	$ 27,052,930	$ 26,240,614
Net income	1,669,860	1,350,224
Cash dividend	(611,571)	(611,571)
Exercise of stock options		124,350
Exercise of stock options (in Shares)		(15,000)
Tax effect from exercise and forfeiture of stock options		(52,156)
Compensation expense related to stock options	13,000	1,469
Common Stock [Member]
Balance	611,571	611,571	607,821
Balance (in Shares)	2,446,286	2,446,286	2,431,286
Exercise of stock options		3,750
Exercise of stock options (in Shares)		15,000
Additional Paid-in Capital [Member]
Balance	6,321,411	6,308,411	6,238,498
Exercise of stock options		120,600
Tax effect from exercise and forfeiture of stock options		(52,156)
Compensation expense related to stock options	13,000	1,469
Retained Earnings [Member]
Balance	21,191,237	20,132,948	19,394,295
Net income	1,669,860	1,350,224
Cash dividend	$ (611,571)	$ (611,571)