Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Common Class A [Member]	Common Class B [Member]	Total
Balance (in shares) at Jan. 31, 2014	14,150,000	3,537,000	(1,930,000)
Balance at Jan. 31, 2014	$ 14	$ 4	$ (28,220)	$ 150,837	$ (52,613)	$ (6,958)			$ 63,064
Net (loss) income					12,946		$ 10,729	$ 2,217	12,946
Foreign currency translation adjustment						(460)			(460)
Stock award exercises (in shares)	1,000		199,000
Stock award exercises			$ 3,749	(5,188)	(138)				(1,577)
Stock-based compensation income tax benefits (deficiencies)				(15)					(15)
Stock compensation expense				4,993					4,993
Dividends declared ($0.288 and $0.24 per Class A and Class B share, respectively)					(4,452)				(4,452)
Proceeds from stock issuance, net of costs (in shares)	2,000,000						2,000,000
Proceeds from stock issuance, net of costs	$ 2			37,044					37,046
Restricted stock (in shares)	1,000		121,000
Restricted stock			$ 1,494	(2,125)	(349)				(980)
Balance (in shares) at Jan. 31, 2015	16,152,000	3,537,000	(1,610,000)
Balance at Jan. 31, 2015	$ 16	$ 4	$ (22,977)	185,546	(44,606)	(7,418)			110,565
Amount					4,452				4,452
Net (loss) income					8,912		$ 7,606	1,306	8,912
Foreign currency translation adjustment						(1,311)			(1,311)
Stock award exercises (in shares)			105,000
Stock award exercises			$ 2,207	(3,289)	(9)				(1,091)
Stock-based compensation income tax benefits (deficiencies)				736					736
Stock compensation expense				7,440					7,440
Dividends declared ($0.288 and $0.24 per Class A and Class B share, respectively)					5,235				5,235
Proceeds from stock issuance, net of costs (in shares)	450,000						450,000
Proceeds from stock issuance, net of costs				8,365					8,365
Restricted stock (in shares)	2,000		139,000
Restricted stock			$ 2,053	(3,378)	(45)				(1,370)
Balance (in shares) (Scenario, Previously Reported [Member]) at Jan. 31, 2016	16,604,000	3,537,000	(1,366,000)
Balance (in shares) at Jan. 31, 2016	16,604,000	3,537,000	(1,366,000)
Balance (Scenario, Previously Reported [Member]) at Jan. 31, 2016	$ 16	$ 4	$ (18,717)	195,420	(40,983)	(8,729)			127,011
Balance (Restatement Adjustment [Member])				388	607				995
Balance at Jan. 31, 2016	16	4	(18,717)	195,808	(40,376)	(8,729)			128,006
Amount					(5,235)				(5,235)
Net (loss) income					(15,450)		$ (13,211)	$ (2,239)	(15,450)
Foreign currency translation adjustment						98			98
Stock award exercises (in shares)			59,000
Stock award exercises			$ 795	(1,406)					(611)
Stock-based compensation income tax benefits (deficiencies)				89					89
Stock compensation expense				7,323					7,323
Dividends declared ($0.288 and $0.24 per Class A and Class B share, respectively)					(5,301)				(5,301)
Restricted stock (in shares)	1,000		182,000
Restricted stock			$ 2,752	(4,220)					(1,468)
Balance (in shares) at Jan. 31, 2017	16,605,000	3,537,000	(1,125,000)
Balance at Jan. 31, 2017	$ 16	$ 4	$ (15,170)	197,594	(61,127)	(8,631)			112,686
Amount					$ 5,301				$ 5,301