STOCKHOLDERS' EQUITY (Details) (USD $)	12 Months Ended			16 Months Ended
	Jan. 31, 2013 Class	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2013 Class	Sep. 30, 2011	Dec. 14, 2010 Class
Dividends [Abstract]
Number of classes of common stock	2			2		2
Dividends common stock percentage that Class A is entitled to as compared to class B (in hundredths)	120.00%
Dividends declared	$ 8,677,000	$ 4,095,000	$ 3,296,000
Fair value of shares issued	622,000	1,513,000	946,000
Stock Repurchase Activity [Abstract]
Number of shares authorized for repurchase (in shares)					1,000,000
Cash consideration for repurchase of common stock	7,530,000	4,319,000	0	11,800,000
Total shares remain available for purchase under the plan	52,000			52,000
Dividends Declaration Date One [Member]
Dividends [Abstract]
Declaration date	Dec. 11, 2012
Record date	Dec. 26, 2012
Payable	Feb. 08, 2013
Dividends declared	947,000
Fair value of shares issued	146,000
Dividends Declaration Date Two [Member]
Dividends [Abstract]
Declaration date	Dec. 02, 2012
Record date	Dec. 18, 2012
Payable	Dec. 28, 2012
Dividends declared	4,359,000
Fair value of shares issued	0
Dividends Declaration Date Three [Member]
Dividends [Abstract]
Declaration date	Sep. 05, 2012
Record date	Nov. 27, 2012
Payable	Dec. 28, 2012
Dividends declared	954,000
Fair value of shares issued	122,000
Dividends Declaration Date Four [Member]
Dividends [Abstract]
Declaration date	Jun. 12, 2012
Record date	Aug. 28, 2012
Payable	Oct. 09, 2012
Dividends declared	922,000
Fair value of shares issued	166,000
Dividends Declaration Date Five [Member]
Dividends [Abstract]
Declaration date	Mar. 20, 2012
Record date	Jun. 04, 2012
Payable	Jul. 16, 2012
Dividends declared	893,000
Fair value of shares issued	206,000
Dividends Declaration Date Six [Member]
Dividends [Abstract]
Declaration date	Dec. 14, 2011
Record date	Mar. 03, 2012
Payable	Apr. 23, 2012
Dividends declared	948,000
Fair value of shares issued	$ 128,000
Common Class A [Member]
Dividends [Abstract]
Stock voting right (in votes per share)	1			1		0.05
Dividends common stock percentage that Class A is entitled to as compared to class B (in hundredths)	120.00%
Stock Repurchase Activity [Abstract]
Shares repurchased (in shares)	517,000			852,000
Common Class A [Member] | Dividends Declaration Date One [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.072			$ 0.072
Class A shares issued (in shares)	10,000
Common Class A [Member] | Dividends Declaration Date Two [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.288			$ 0.288
Class A shares issued (in shares)	0
Common Class A [Member] | Dividends Declaration Date Three [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.072			$ 0.072
Class A shares issued (in shares)	10,000
Common Class A [Member] | Dividends Declaration Date Four [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.072			$ 0.072
Class A shares issued (in shares)	13,000
Common Class A [Member] | Dividends Declaration Date Five [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.072			$ 0.072
Class A shares issued (in shares)	15,000
Common Class A [Member] | Dividends Declaration Date Six [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.072			$ 0.072
Class A shares issued (in shares)	12,000
Common Class B [Member]
Dividends [Abstract]
Stock voting right (in votes per share)	0.05			0.05		1
Stock Repurchase Activity [Abstract]
Shares repurchased (in shares)	55,000			96,000
Common Class B [Member] | Dividends Declaration Date One [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.060			$ 0.060
Common Class B [Member] | Dividends Declaration Date Two [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.240			$ 0.240
Common Class B [Member] | Dividends Declaration Date Three [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.060			$ 0.060
Common Class B [Member] | Dividends Declaration Date Four [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.060			$ 0.060
Common Class B [Member] | Dividends Declaration Date Five [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.060			$ 0.060
Common Class B [Member] | Dividends Declaration Date Six [Member]
Dividends [Abstract]
Dividend (in dollars per share)	$ 0.060			$ 0.060