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Note 5 - Debt Obligations (Details Textual) - USD ($)
3 Months Ended
Apr. 04, 2021
Mar. 29, 2020
Jan. 03, 2021
May 06, 2020
Nov. 06, 2019
Line of Credit, Current $ 15,000,000   $ 15,000,000    
Gain (Loss) on Extinguishment of Debt, Total 1,192,000 $ 0      
Heritage Bank of Commerce [Member] | Paycheck Protection Program [Member]          
Debt Instrument, Face Amount       $ 1,200,000  
Debt Instrument, Interest Rate, Stated Percentage       1.00%  
Gain (Loss) on Extinguishment of Debt, Total 1,200,000        
Heritage Bank of Commerce [Member] | Revolving Credit Facility [Member]          
Line of Credit, Current $ 15,000,000.0   $ 15,000,000.0    
Debt Instrument, Interest Rate, Effective Percentage 3.75%   3.75%    
Interest Expense, Debt, Total $ 32,000 $ 80,000      
Debt Instrument, Interest Rate, Stated Percentage         5.50%