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Note 7 - Debt Obligations (Details Textual) - USD ($)
Nov. 16, 2021
Dec. 11, 2020
Nov. 06, 2019
Jan. 02, 2022
Aug. 16, 2021
Jan. 03, 2021
May 06, 2020
Dec. 21, 2018
Sep. 28, 2018
Line of Credit, Current       $ 15,000,000   $ 15,000,000      
Paycheck Protection Program [Member]                  
Debt Instrument, Face Amount           1,200,000      
Heritage Bank of Commerce [Member] | Paycheck Protection Program [Member]                  
Debt Instrument, Interest Rate, Stated Percentage             1.00%    
Debt Instrument, Face Amount             $ 1,200,000    
Heritage Bank of Commerce [Member] | Revolving Credit Facility [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity               $ 15,000,000.0 $ 9,000,000.0
Minimum Cash Required for Covenant Related to Credit Facility     $ 3,000,000.0   $ 3,000,000.0     $ 3,000,000.0  
Line of Credit Facility, Expiration Period (Year)   1 year 1 year            
Debt Instrument, Interest Rate, Stated Percentage     5.50%            
Non-refundable Facility Fees $ 45,000                
Line of Credit, Current       $ 15,000,000.0   $ 15,000,000.0      
Debt Instrument, Interest Rate, Effective Percentage       3.75%   3.75%      
Heritage Bank of Commerce [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]                  
Debt Instrument, Basis Spread on Variable Rate   0.50% 0.50%