EARNINGS PER SHARE COMPUTATIONS (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Numerator [Abstract]
Net income	$ 1,619,999	$ 1,490,234	$ 2,878,697	$ 2,902,741
Denominator [Abstract]
Weighted average common shares outstanding during the period for basic computation (in shares)	14,679,746	14,659,281	14,681,423	14,659,331
Dilutive effect of stock-based compensation plans (in shares)	59,802	173,958	54,730	165,349
Weighted average common shares outstanding during the period for diluted computation (in shares)	14,739,548	14,833,239	14,736,153	14,824,680
Earnings per share, basic (in dollars per share)	$ 0.11	$ 0.10	$ 0.20	$ 0.20
Earnings per share, diluted (in dollars per share)	$ 0.11	$ 0.10	$ 0.20	$ 0.20
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)	1,098,849	616,585	1,098,849	616,585