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Line of Credit and Borrowing Agreement (Details Narrative)
$ in Thousands
12 Months Ended
May 31, 2019
USD ($)
Apr. 25, 2019
USD ($)
Apr. 15, 2019
USD ($)
Jan. 31, 2019
USD ($)
Dec. 26, 2018
USD ($)
Nov. 01, 2019
USD ($)
Proceeds from line of credit     $ 2,000      
Repayments of line of credit   $ 2,000        
First Secured Equipment Notes Payable [Member]            
Fixed rate       4.13%    
Loan term       84 months    
Debt monthly principal and interest payments       $ 103    
Second Secured Equipment Notes Payable [Member]            
Fixed rate 3.98%          
Loan term 84 months          
Debt monthly principal and interest payments $ 102          
Wells Fargo Bank N.A [Member] | Master Collateral Loan and Security Agreement [Member]            
Proceeds from line of credit         $ 15,000  
Loan term         7 years  
Financial covenants, description         Total Liabilities divided by Tangible Net Worth (as defined) not greater than 2.5 to 1.0 at each fiscal quarter, Quick Ratio (as defined) not less than 1.0 to 1.0 at each fiscal quarter end, and Net income after taxes not less than one dollar on a quarterly basis, determined as of each fiscal quarter end.  
Liabilities to tangible net worth ratio         2.5  
Quick ratio         1.0  
Financial covenants net income after tax, minimum         $ 1  
Wells Fargo Bank N.A [Member] | Master Collateral Loan and Security Agreement [Member] | Loan Agreement, Receipt One [Member]            
Proceeds from line of credit         $ 7,500  
Fixed rate         4.13%  
Loan receipt, description         The first funding of $7,500 was received on December 28, 2018.  
Wells Fargo Bank N.A [Member] | Master Collateral Loan and Security Agreement [Member] | Loan Agreement, Receipt Two [Member]            
Proceeds from line of credit         $ 7,500  
Fixed rate         3.98%  
Loan receipt, description         The second funding was received on April 23, 2019.  
Revolving Credit Facility [Member]            
Line of credit facility, maximum borrowing capacity           $ 7,500
Debt covenant, maximum allowable capital expenditures           $ 7,500
Revolving Credit Facility [Member] | LIBOR [Member]            
Debt instrument, basis spread on variable rate           1.50%
Revolving Credit Facility [Member] | Wells Fargo Bank N.A [Member]            
Line of credit expiration date           Mar. 01, 2020