COMPUTATION OF NET INCOME PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 2,586	$ 5,090	$ 4,766	$ 5,999
Less: Dividends declared	(1,313)	(1,118)	(3,922)	(3,334)
Undistributed net income	1,273	3,972	844	2,665
Net income per share [Abstract]
Dividends declared	1,313	1,118	3,922	3,334
Allocation of undistributed net income	1,273	3,972	844	2,665
Net income attributable to common stock	2,586	5,090	4,766	5,999
Common Class A [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	2,208	4,218	4,067	4,971
Less: Dividends declared	(1,121)	(926)	(3,346)	(2,761)
Undistributed net income	1,087	3,292	721	2,210
Net income per share [Abstract]
Dividends declared	1,121	926	3,346	2,761
Allocation of undistributed net income	1,087	3,292	721	2,210
Net income attributable to common stock	$ 2,208	$ 4,218	$ 4,067	$ 4,971
Weighted average shares of common stock outstanding-basic (in shares)	15,559	12,865	15,431	12,755
Weighted average potential shares of common stock (in shares)	749	622	777	719
Weighted average shares of common stock and potential common shares outstanding-diluted (in shares)	16,308	13,487	16,208	13,474
Basic net income per common share (in dollars per share)	$ 0.14	$ 0.33	$ 0.26	$ 0.39
Diluted net income per common share (in dollars per share)	$ 0.14	$ 0.31	$ 0.25	$ 0.37
Antidilutive securities excluded from computation of net income per share (in shares)	640	330	490	277
Common Class B [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 378	$ 872	$ 699	$ 1,028
Less: Dividends declared	(192)	(192)	(576)	(573)
Undistributed net income	186	680	123	455
Net income per share [Abstract]
Dividends declared	192	192	576	573
Allocation of undistributed net income	186	680	123	455
Net income attributable to common stock	$ 378	$ 872	$ 699	$ 1,028
Weighted average shares of common stock outstanding-basic (in shares)	3,203	3,189	3,200	3,180
Weighted average potential shares of common stock (in shares)	83	76	83	90
Weighted average shares of common stock and potential common shares outstanding-diluted (in shares)	3,286	3,265	3,283	3,270
Basic net income per common share (in dollars per share)	$ 0.12	$ 0.27	$ 0.22	$ 0.32
Diluted net income per common share (in dollars per share)	$ 0.12	$ 0.27	$ 0.21	$ 0.31
Antidilutive securities excluded from computation of net income per share (in shares)	120	67	92	38