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Liabilities - Additional Information (Details)
1 Months Ended 12 Months Ended
Mar. 08, 2018
USD ($)
Jan. 31, 2017
USD ($)
Dec. 28, 2018
USD ($)
Dec. 28, 2018
JPY (¥)
Dec. 29, 2017
USD ($)
Dec. 29, 2017
JPY (¥)
Sep. 30, 2013
CHF (SFr)
Liabilities [Line Items]              
Line of Credit, Current     $ 3,780,000   $ 4,438,000    
Asset retirement obligations     206,000   202,000    
Lease Schedule 011              
Liabilities [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity $ 500,000            
Line of Credit Facility, Remaining Borrowing Capacity     387,000        
Lease Schedule 010R              
Liabilities [Line Items]              
Capital Lease Obligations $ 1,560,000   864,000        
Sale Leaseback Transaction Net Proceeds Expiration Term 24 months            
lease schedule 009R              
Liabilities [Line Items]              
Capital Lease Obligations   $ 1,957,000 $ 83,000   1,067,000    
Sale Leaseback Transaction Net Proceeds Expiration Term   24 months          
Hardware Equipment | Lease Schedule 011              
Liabilities [Line Items]              
Sale Lease back Transaction Imputed Interest Rate Term 3.94% per $1            
Hardware Equipment | Lease Schedule 010R              
Liabilities [Line Items]              
Sale Lease back Transaction Imputed Interest Rate Term 3.94% per $1            
Hardware Equipment | lease schedule 009R              
Liabilities [Line Items]              
Sale Lease back Transaction Imputed Interest Rate Term   3.94% per $1          
Non-Hardware Equipment | Lease Schedule 011              
Liabilities [Line Items]              
Sale Lease back Transaction Imputed Interest Rate Term 4.75% per $1            
Non-Hardware Equipment | Lease Schedule 010R              
Liabilities [Line Items]              
Sale Lease back Transaction Imputed Interest Rate Term 4.75% per $1            
Non-Hardware Equipment | lease schedule 009R              
Liabilities [Line Items]              
Sale Lease back Transaction Imputed Interest Rate Term   4.75% per $1          
Mizuho Bank              
Liabilities [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity | ¥       ¥ 500,000,000      
Line of Credit Facility, Interest Rate Description     (approximately 0.06% as of December 28, 2018) plus a 0.50% spread, and may be renewed quarterly (the current line expires on February 21, 2019).        
Line of credit facility, interest rate     0.06% 0.06%      
Line of credit facility, spread rate     0.50%        
Line of credit facility, expiration date     Feb. 21, 2019        
Line of Credit, Current     $ 3,780,000 ¥ 417,500,000 4,438,000 ¥ 500,000,000  
Interest Rate Increase In Case Of Default     14.00%        
Line of Credit Facility, Remaining Borrowing Capacity     $ 747,000 ¥ 82,500,000 0    
Line of credit facility, renewed expiration date     May 21, 2019        
Credit Suisse Bank              
Liabilities [Line Items]              
Line of Credit Facility, Current Borrowing Capacity     $ 1,000,000   1,000,000   SFr 1,000,000
Percentage Of Commission On Outstanding Notes Payable     0.25%        
Borrowings outstanding     $ 0   $ 0