Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Additional Information (Details)

v3.21.2
Shareholders' Equity - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 02, 2021
Jan. 29, 2021
Jun. 27, 2020
Mar. 28, 2020
Jul. 03, 2021
Jun. 27, 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)         2,407,410   1,829,982  
Common stock, outstanding shares (in shares)         2,407,410   1,829,982  
Common stock par value         $ 0.001   $ 0.001  
Options outstanding         131,500   113,900 44,400
Options granted         38,000   74,000  
Share-based compensation expense         $ 180,000      
Warrants outstanding         33,363   33,363  
Warrant exercise price         $ 3.40   $ 3.40  
Warrant expiration date         2021-11   2021-11  
Stock Options                
Shareholders Equity [Line Items]                
Share-based compensation expense     $ 41,000     $ 72,000    
Unrecognized compensation expense, net of estimated forfeitures         $ 86,000      
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         101,000   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            
Common stock par value   $ 0.001            
Common stock purchase price per share   $ 10.50            
Common stock gross proceeds before deducting placement agent fees and offering expenses $ 6,000              
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    
Stock issued for services, value           $ 345,000    
Articles of Incorporation                
Shareholders Equity [Line Items]                
Common stock, shares authorized (in shares)     200,000,000     200,000,000