Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock	Warrants	Additional Paid-in Capital	Retained Earnings	Noncontrolling Interest	Treasury Stock
Beginning Balance at Jan. 31, 2011	$ 97,645,000	$ 2,040,000	$ 601,000	$ 88,561,000	$ 6,476,000		$ (33,000)
Beginning Balance Shares, Outstanding at Jan. 31, 2011		13,598,994
Net income (loss)	8,970,000				9,272,000	(302,000)
Exercise of stock options	507,000	8,000		499,000
Exercise of stock options, Shares	55,038	55,038
Conversion of stock warrants	23,000	1,000	(11,000)	33,000
Conversion of stock warrants, Shares		3,000
Stock option vesting	637,000			637,000
Reversal of excess tax benefit on forfeited stock options	(16,000)			(16,000)
Dividends	(6,804,000)				(6,804,000)
Others	1,000					1,000
Others, Shares		833
Ending Balance at Jan. 31, 2012	100,963,000	2,049,000	590,000	89,714,000	8,944,000	(301,000)	(33,000)
Ending Balance Shares, Outstanding at Jan. 31, 2012		13,657,865
Net income (loss)	21,817,000				23,265,000	(1,448,000)
Exercise of stock options	1,436,000	23,000		1,413,000
Exercise of stock options, Shares	153,962	153,962
Conversion of stock warrants	1,240,000	24,000	(590,000)	1,806,000
Conversion of stock warrants, Shares		160,000
Stock option vesting	1,316,000			1,316,000
Release of restricted stock	25,000			25,000
Release of restricted stock, Shares		2,500
Excess tax benefit on exercised stock options and converted warrants	730,000			730,000
Dividends	(8,359,000)				(8,359,000)
Ending Balance at Jan. 31, 2013	$ 119,168,000	$ 2,096,000	$ 0	$ 95,004,000	$ 23,850,000	$ (1,749,000)	$ (33,000)
Ending Balance Shares, Outstanding at Jan. 31, 2013		13,974,327