COMPUTATION OF NET INCOME (LOSS) PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 1,254	$ 959	$ (9)	$ 2,803
Less: Dividends declared	(1,089)	(1,110)	(2,177)	(2,187)
Undistributed net income (loss)	165	(151)	(2,186)	616
Net income (loss) per share [Abstract]
Dividends declared	1,089	1,110	2,177	2,187
Allocation of undistributed net income (loss)	165	(151)	(2,186)	616
Net income (loss)	1,254	959	(9)	2,803
Common Class A [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	1,036	795	(6)	2,319
Less: Dividends declared	(900)	(920)	(1,799)	(1,810)
Undistributed net income (loss)	136	(125)	(1,805)	509
Net income (loss) per share [Abstract]
Dividends declared	900	920	1,799	1,810
Allocation of undistributed net income (loss)	136	(125)	(1,805)	509
Net income (loss)	1,036	795	(6)	2,319
Weighted average shares of common stock outstanding-basic (in shares)	12,473	12,649	12,451	12,671
Weighted average potential shares of common stock (in shares)	430	433	0	473
Weighted average shares of common stock and potential common shares outstanding-diluted (in shares)	12,903	13,082	12,451	13,144
Basic net income (loss) per common share (in dollars per share)	$ 0.08	$ 0.06	$ 0	$ 0.18
Diluted net income (loss) per common share (in dollars per share)	$ 0.08	$ 0.06	$ 0	$ 0.18
Antidilutive securities excluded from computation of earnings per share (in shares)	2,592	2,306	2,915	2,199
Common Class B [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	218	164	(3)	484
Less: Dividends declared	(189)	(190)	(378)	(377)
Undistributed net income (loss)	29	(26)	(381)	107
Net income (loss) per share [Abstract]
Dividends declared	189	190	378	377
Allocation of undistributed net income (loss)	29	(26)	(381)	107
Net income (loss)	$ 218	$ 164	$ (3)	$ 484
Weighted average shares of common stock outstanding-basic (in shares)	3,145	3,164	3,145	3,166
Weighted average potential shares of common stock (in shares)	86	100	0	108
Weighted average shares of common stock and potential common shares outstanding-diluted (in shares)	3,231	3,264	3,145	3,274
Basic net income (loss) per common share (in dollars per share)	$ 0.07	$ 0.05	$ 0	$ 0.15
Diluted net income (loss) per common share (in dollars per share)	$ 0.07	$ 0.05	$ 0	$ 0.15
Antidilutive securities excluded from computation of earnings per share (in shares)	370	349	456	365