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Note 7 - Debt Obligations (Details Textual) - USD ($)
$ in Millions
Dec. 11, 2020
Nov. 06, 2019
Dec. 21, 2018
Jan. 03, 2021
May 06, 2020
Dec. 29, 2019
Sep. 28, 2019
Dec. 20, 2018
Sep. 28, 2018
Line of Credit, Current       $ 15.0   $ 15.0      
Heritage Bank of Commerce [Member] | Paycheck Protection Program [Member]                  
Debt Instrument, Interest Rate, Stated Percentage         1.00%        
Debt Instrument, Face Amount       1.2 $ 1.2        
Heritage Bank of Commerce [Member] | Revolving Credit Facility [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity     $ 15.0       $ 9.0 $ 9.0 $ 9.0
Minimum Cash Required for Covenant Related to Credit Facility   $ 3.0 $ 3.0            
Line of Credit Facility, Expiration Period (Year) 1 year 1 year 1 year            
Debt Instrument, Interest Rate, Stated Percentage   5.50%              
Line of Credit, Current       $ 15.0   $ 15.0      
Debt Instrument, Interest Rate, Effective Percentage       3.75%   5.50%      
Heritage Bank of Commerce [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]                  
Debt Instrument, Basis Spread on Variable Rate 0.50% 0.50%