Consolidated Statement of Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common stock [Member]	Additional paid- in capital [Member]	Accumulated deficit [Member]
Balance at Jan. 31, 2015	$ 174,269	$ 544	$ 293,992	$ (120,267)
Balance, common stock, shares at Jan. 31, 2015	54,420,228	54,420,228
Share-based compensation expense	2,393	0	2,393	0
Stock Issued During Period, Shares, New Issues		2,030
Stock Issued During Period, Value, New Issues	70	0	70	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	56,150	56,150
Stock Issued During Period, Value, Stock Options Exercised	368	1	367	0
Excess tax benefit related to exercise of stock options	359		359
Net income	4,278			4,278
Balance at May. 02, 2015	$ 181,737	$ 545	$ 297,181	$ (115,989)
Balance, common stock, shares at May. 02, 2015	54,478,408	54,478,408