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Note 16 - Subsequent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 09, 2022
Feb. 28, 2022
Jan. 02, 2022
Jan. 03, 2021
Dec. 29, 2019
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.001 $ 0.001  
Proceeds from Issuance of Common Stock     $ 1,342 $ 9,296 $ 9,437
Common Stock [Member]          
Stock Issued During Period, Shares, New Issues (in shares)     198,000 2,642,000 1,314,000
Subsequent Event [Member] | Registered Direct Offering [Member]          
Stock Issued During Period, Shares, New Issues (in shares)   310,000      
Proceeds from Issuance of Common Stock   $ 1,500      
Subsequent Event [Member] | Registered Direct Offering [Member] | Common Stock [Member]          
Stock Issued During Period, Shares, New Issues (in shares) 310,000        
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.001        
Proceeds from Issuance of Common Stock $ 1,500        
Shares Issued, Price Per Share (in dollars per share) $ 4.78