EARNINGS PER SHARE COMPUTATIONS (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Numerator [Abstract]
Net income	$ 2,790,735	$ 2,081,886	$ 5,669,432	$ 4,984,627
Denominator [Abstract]
Weighted average common shares outstanding during the period for basic computation (in shares)	14,682,776	14,659,383	14,683,286	14,659,402
Dilutive effect of stock-based compensation plans (in shares)	51,476	140,431	50,178	129,091
Weighted average common shares outstanding during the period for diluted computation (in shares)	14,734,252	14,799,814	14,733,464	14,788,493
Earnings per share, basic (in dollars per share)	$ 0.19	$ 0.14	$ 0.39	$ 0.34
Earnings per share, diluted (in dollars per share)	$ 0.19	$ 0.14	$ 0.38	$ 0.34
Employee and non-employee director stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the computation of diluted earnings per share (in shares)	1,092,447	1,086,929	1,092,447	1,086,929