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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Common stock [Member]
Additional Paid-in Capital [Member]
Accumulated deficit [Member]
Unrestricted stock [Member]
Balance at Jan. 31, 2015 $ 174,269 $ 544 $ 293,992 $ (120,267)  
Balance, common stock, shares at Jan. 31, 2015   54,420,228      
Share-based compensation expense 10,876   10,876    
Issuance of unrestricted stock awards 280 $ 0 280    
Issuance of unrestricted stock awards (in shares)         7,947
Exercise of options and warrants to purchase common stock 912 $ 2 910    
Exercise of options and warrants to purchase common stock (in shares)   115,364      
Vesting of restricted stock units 0   0    
Vesting of restricted stock units (in shares)   (51,546)      
Stock Issued During Period, Value, Conversion of Convertible Securities (322) $ 0 (322)    
Stock Issued During Period, Shares, Conversion of Convertible Securities   (9,462)      
Excess tax benefit 608   608    
Issuance of common stock to employees under employee stock purchase plan 178   178    
Issuance of common stock to employees under employee stock purchase plan (in shares)   5,018      
Net income 57,680     57,680  
Balance at Jan. 30, 2016 244,481 $ 546 306,522 (62,587)  
Balance, common stock, shares at Jan. 30, 2016   54,590,641.000      
Issuance of unrestricted stock awards 11,655 $ 0 11,655    
Issuance of unrestricted stock awards (in shares)   0      
Exercise of options and warrants to purchase common stock 3,289 $ 2 3,287    
Exercise of options and warrants to purchase common stock (in shares)   225,767      
Issuance of common stock (in shares)   (123,428)     (6,781)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 1 $ 1      
Common shares withheld for taxes (1,904)   (1,904)    
Common shares withheld for taxes (in shares)   (46,750)      
Stock Issued During Period, Value, New Issues (280)   (280)    
Excess tax benefit 1,555   1,555    
Issuance of common stock to employees under employee stock purchase plan 208   208    
Issuance of common stock to employees under employee stock purchase plan (in shares)   5,087      
Net income 71,840     71,840  
Balance at Jan. 28, 2017 $ 331,405 $ 549 321,603 9,253  
Balance, common stock, shares at Jan. 28, 2017 54,904,954 54,904,954.000      
Issuance of unrestricted stock awards $ 16,114   16,114    
Issuance of unrestricted stock awards (in shares)   0      
Exercise of options and warrants to purchase common stock 9,601 $ 3 9,598    
Exercise of options and warrants to purchase common stock (in shares)   327,980      
Issuance of common stock (in shares)   (229,553)     (4,464)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 2 $ 2      
Common shares withheld for taxes (1,504)   (1,504)    
Common shares withheld for taxes (in shares)   (33,327)      
Stock Issued During Period, Value, New Issues (238) $ 0 (238)    
Issuance of common stock to employees under employee stock purchase plan 251   251    
Issuance of common stock to employees under employee stock purchase plan (in shares)   4,465      
Net income 102,451        
Balance at Feb. 03, 2018 $ 458,558 $ 554 $ 346,300 $ 111,704  
Balance, common stock, shares at Feb. 03, 2018 55,438,089 55,438,089.000