Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Additional Information (Details)

v3.20.1
Shareholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2019
Nov. 08, 2016
Mar. 28, 2020
Mar. 30, 2019
Sep. 28, 2019
Dec. 28, 2019
Dec. 29, 2018
Shareholders Equity [Line Items]              
Common stock, shares authorized (in shares)     10,000,000     10,000,000  
Common stock, issued shares (in shares)     1,993,578     1,919,048  
Common stock, outstanding shares (in shares)     1,993,578     1,919,048  
Stock issued new during period, shares         223,214    
Stock issued new during period, value         $ 1,000    
Share based compensation     $ 376   $ 281    
Share based compensation amortized period     2021-09        
Options outstanding     78,400     44,400 100,900
Options granted     34,000        
Estimated future share-based compensation expense     $ 194        
Share-based compensation award amortized period     2021-02        
Warrants outstanding     33,363   33,363    
Warrant exercise price     $ 3.40   $ 3.40    
Warrant expiration date     May 31, 2020        
Stock Options              
Shareholders Equity [Line Items]              
Stock options, exercisable     44,400        
Weighted average exercise price, exercisable     $ 12.28        
Share-based compensation expense     $ 60 $ 60      
2016 Plan              
Shareholders Equity [Line Items]              
Options expiration date     Oct. 28, 2026        
Options authorized for issuance     400,000        
Options outstanding     38,000     4,000  
2016 Plan | Employees              
Shareholders Equity [Line Items]              
Options granted, vesting period     2 years        
2016 Plan | Non-Employee Directors              
Shareholders Equity [Line Items]              
Options granted, vesting period     6 months        
2011 Plan              
Shareholders Equity [Line Items]              
Options expiration date     May 12, 2021        
Options outstanding     40,400     40,400  
Additional awards to be granted after adoption of 2016 plan     0        
Energy Efficiency Investments LLC Securities Purchase Agreement | Notes Payable              
Shareholders Equity [Line Items]              
Debt issuance date   Nov. 08, 2016          
Debt interest rate   3.00%          
Energy Efficiency Investments LLC Securities Purchase Agreement | Notes Payable | Maximum              
Shareholders Equity [Line Items]              
Debt face amount   $ 7,732          
Common Stock | Energy Efficiency Investments LLC Securities Purchase Agreement              
Shareholders Equity [Line Items]              
Common shares, returned 122,257            
Contractor              
Shareholders Equity [Line Items]              
Stock issued for services, shares     74,530      
Stock issued for services, value     $ 376      
Articles of Incorporation              
Shareholders Equity [Line Items]              
Common stock, shares authorized (in shares)     10,000,000