Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Numerator
Net income (loss)	$ 1,643,830	$ 634,546	$ (8,477,637)	$ 1,955,095
Denominator
Denominator for basic earnings per share (Weighted-average shares which reflect 356,441 and 354,364 and 125,322 and 125,322 weighted average common shares in the treasury as a result of the stock repurchase program for the three months and six months in each of 2012 and 2011, respectively)	5,271,997	5,225,020	5,235,957	5,223,890
Effect of dilutive securities from restricted stock plan and from dilutive effect of stock options	169,170	120,708	0	117,088
Denominator for diluted earnings per share (adjusted weighted average shares)	5,441,167	5,345,728	5,235,957	5,340,978
Basic earnings (loss) per share	$ 0.31	$ 0.12	$ (1.62)	$ 0.37
Diluted earnings (loss) per share	$ 0.30	$ 0.12	$ (1.62)	$ 0.37