COMPUTATION OF NET INCOME PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 2,049	$ 1,825	$ 2,040	$ 4,628
Less: Dividends declared	(1,090)	(1,060)	(3,267)	(3,247)
Undistributed net income (loss)	959	765	(1,227)	1,381
Net income per share [Abstract]
Dividends declared	1,090	1,060	3,267	3,247
Allocation of undistributed net income (loss)	959	765	(1,227)	1,381
Net income	2,049	1,825	2,040	4,628
Common Class A [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	1,694	1,503	1,688	3,822
Less: Dividends declared	(901)	(873)	(2,700)	(2,683)
Undistributed net income (loss)	793	630	(1,012)	1,139
Net income per share [Abstract]
Dividends declared	901	873	2,700	2,683
Allocation of undistributed net income (loss)	793	630	(1,012)	1,139
Net income	1,694	1,503	1,688	3,822
Weighted average shares of common stock outstanding-basic (in shares)	12,526	12,561	12,477	12,634
Weighted average potential shares of common stock (in shares)	464	455	453	473
Weighted average shares of common stock and potential common shares outstanding-diluted (in shares)	12,990	13,016	12,930	13,107
Basic net income per common share (in dollars per share)	$ 0.14	$ 0.12	$ 0.14	$ 0.30
Diluted net income per common share (in dollars per share)	$ 0.13	$ 0.12	$ 0.13	$ 0.29
Antidilutive securities excluded from computation of earnings per share (in shares)	2,654	2,484	2,530	2,289
Common Class B [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	355	322	352	806
Less: Dividends declared	(189)	(187)	(567)	(564)
Undistributed net income (loss)	166	135	(215)	242
Net income per share [Abstract]
Dividends declared	189	187	567	564
Allocation of undistributed net income (loss)	166	135	(215)	242
Net income	$ 355	$ 322	$ 352	$ 806
Weighted average shares of common stock outstanding-basic (in shares)	3,149	3,157	3,146	3,163
Weighted average potential shares of common stock (in shares)	86	103	88	109
Weighted average shares of common stock and potential common shares outstanding-diluted (in shares)	3,235	3,260	3,234	3,272
Basic net income per common share (in dollars per share)	$ 0.11	$ 0.10	$ 0.11	$ 0.25
Diluted net income per common share (in dollars per share)	$ 0.11	$ 0.10	$ 0.11	$ 0.25
Antidilutive securities excluded from computation of earnings per share (in shares)	354	384	363	369