Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Market Based Restricted Stock Units (Details)

v3.20.1
Shareholders' Equity - Market Based Restricted Stock Units (Details) - USD ($)
12 Months Ended
May 02, 2019
Aug. 18, 2016
Feb. 01, 2020
Feb. 02, 2019
Feb. 03, 2018
Restricted Stock - Total Shareholder Return [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted, shares     94,000 75,000 56,000
Award Vesting Period     3 years 3 years 3 years
Fair Value Assumptions and Methodology [Abstract]          
Total grant date fair value     $ 482,000 $ 859,000 $ 860,000
Total grant date fair value per share     $ 5.14   $ 15.30
Expected volatility rate         75.00%
Weighted average expected life (in years)     3 years 3 years 3 years
Risk-free interest rate         1.50%
Less than 33% [Member] | Restricted Stock - Total Shareholder Return [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of Units Vested     0.00% 0.00% 0.00%
Greater than 33% [Member] | Restricted Stock - Total Shareholder Return [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of Units Vested     50.00% 50.00% 50.00%
Greater than 50% [Member] | Restricted Stock - Total Shareholder Return [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of Units Vested     100.00% 100.00% 100.00%
Greater than 100% [Member] | Restricted Stock - Total Shareholder Return [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of Units Vested     150.00% 150.00% 150.00%
Market Based Stock Restricted Stock Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted, shares 68,000        
Fair Value Assumptions and Methodology [Abstract]          
Total grant date fair value $ 220,000        
Expected volatility rate 80.00%        
Weighted average expected life (in years) 2 years 11 months 1 day        
Risk-free interest rate 2.50%        
Tranche 1 (one year) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of Units Vested   33.30%      
Award Vesting Period 1 year        
Fair Value Assumptions and Methodology [Abstract]          
Total grant date fair value per share $ 3.66        
Weighted average expected life (in years) 1 year        
Tranche 2 ($20.00/share) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of consecutive trading days 20 days        
Average closing price for 20 consecutive trading days, Lower range limit for vesting $ 20.00        
Continuous employment requisite period 1 year        
Percentage of Units Vested   33.30%      
Fair Value Assumptions and Methodology [Abstract]          
Total grant date fair value per share $ 3.19        
Weighted average expected life (in years) 3 years 3 months 8 days        
Tranche 3 ($40.00/share) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of consecutive trading days 20 days        
Average closing price for 20 consecutive trading days, Lower range limit for vesting $ 40.00        
Continuous employment requisite period 2 years        
Vesting expiration period from date of grant   10 years      
Percentage of Units Vested   33.30%      
Fair Value Assumptions and Methodology [Abstract]          
Total grant date fair value per share $ 2.85        
Weighted average expected life (in years) 4 years 6 months 10 days        
Minimum [Member] | Restricted Stock - Total Shareholder Return [Member]          
Fair Value Assumptions and Methodology [Abstract]          
Total grant date fair value per share       $ 10.70  
Expected volatility rate     74.00% 73.00%  
Risk-free interest rate     1.70% 2.40%  
Maximum [Member] | Restricted Stock - Total Shareholder Return [Member]          
Fair Value Assumptions and Methodology [Abstract]          
Total grant date fair value per share       $ 13.00  
Expected volatility rate     82.00% 76.00%  
Risk-free interest rate     2.30% 2.70%