Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Additional Information (Details)

v3.21.1
Shareholders' Equity - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Feb. 02, 2021
Jan. 29, 2021
Apr. 03, 2021
Mar. 28, 2020
Jan. 02, 2021
Dec. 28, 2019
Shareholders Equity [Line Items]            
Common stock, shares authorized (in shares)     200,000,000   200,000,000  
Common stock, issued shares (in shares)     2,403,410   1,829,982  
Common stock, outstanding shares (in shares)     2,403,410   1,829,982  
Common stock par value     $ 0.001   $ 0.001  
Options outstanding     142,500   113,900 44,400
Options granted     34,000   74,000  
Warrants outstanding     33,363   33,363  
Warrant exercise price     $ 3.40   $ 3.40  
Warrant expiration date     Nov. 30, 2021   Nov. 30, 2021  
Stock Options            
Shareholders Equity [Line Items]            
Share-based compensation expense     $ 109,000 $ 31,000    
Unrecognized compensation expense, net of estimated forfeitures     $ 201,000      
Unrecognized compensation expense, net of estimated forfeitures, period for recognition     2022-01      
2016 Plan            
Shareholders Equity [Line Items]            
Options expiration date     Oct. 28, 2026      
Options authorized for issuance     800,000      
Options outstanding     112,000   78,000  
2011 Plan            
Shareholders Equity [Line Items]            
Options expiration date       May 12, 2021    
Options outstanding     30,500   35,900  
Additional awards to be granted after adoption of 2016 plan       0    
Common Stock | Equity Offering            
Shareholders Equity [Line Items]            
Common stock, shares authorized (in shares) 571,428 571,428        
Common stock par value   $ 0.001        
Common stock purchase price per share   $ 10.50        
Common stock price per share $ 10.50          
Common stock gross proceeds before deducting placement agent fees and offering expenses $ 6,000          
Common stock or common stock equivalents purchase agreement closing offering period     45 days      
Common Stock | Equity Offering | Placement Agency Agreement            
Shareholders Equity [Line Items]            
Percentage of cash fee gross proceeds   7.00%        
Common Stock | Equity Offering | Maximum | Placement Agency Agreement            
Shareholders Equity [Line Items]            
Gross proceeds reimbursement for accountable legal expenses   $ 35,000        
Contractor            
Shareholders Equity [Line Items]            
Stock issued for services, shares     74,530 74,530    
Stock issued for services, value     $ 345,000 $ 345,000    
Articles of Incorporation            
Shareholders Equity [Line Items]            
Common stock, shares authorized (in shares)       200,000,000