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Stock-Based Compensation - RSUs (Details) - RSU awards - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
May 10, 2019
May 10, 2018
Aug. 08, 2017
May 10, 2017
May 11, 2016
Mar. 31, 2019
Apr. 01, 2018
Stock-based compensation              
Granted (in shares)           2,000  
Unrecognized compensation costs (in dollars)           $ 0.6  
Unrecognized compensation costs, period for recognition           2 years  
Award Date May 11, 2016              
Stock-based compensation              
Granted (in shares)         10,000    
Annual vesting percentage         25.00%    
Unrecognized compensation costs (in dollars)           $ 0.7  
Unrecognized compensation costs, period for recognition           1 year  
Award Date May 10, 2017              
Stock-based compensation              
Granted (in shares)       18,000      
Annual vesting percentage       25.00%      
Unrecognized compensation costs (in dollars)           $ 0.1  
Unrecognized compensation costs, period for recognition           2 years  
Award Date August 8, 2017              
Stock-based compensation              
Granted (in shares)     56,000        
Vesting period     4 years        
Denominator in fraction used to calculate number of awards earned     $ 3.20        
Cancelled (in shares)             8,000
Shares outstanding (in shares)             48,000
Award Dates, May 10, 2018 and June 6, 2018              
Stock-based compensation              
Granted (in shares)   21,000          
Annual vesting percentage   25.00%          
Unrecognized compensation costs (in dollars)           $ 0.2  
Unrecognized compensation costs, period for recognition           3 years  
Subsequent Event              
Stock-based compensation              
Granted (in shares) 21,000            
Annual vesting percentage 25.00%