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Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2023
Jan. 02, 2022
Jan. 03, 2021
Dec. 29, 2019
Jan. 01, 2018
Dec. 31, 2017
Deferred Tax Assets, Valuation Allowance $ 56,862 $ 60,353        
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries 100 100        
Unrecognized Tax Benefits, Ending Balance 2,249 $ 2,118 $ 2,176 $ 2,117    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 0          
Federal [Member]            
Operating Loss Carryforwards 175,000       $ 62,900 $ 112,400
State and Local Jurisdiction [Member]            
Operating Loss Carryforwards 91,200          
Research Tax Credit Carryforward [Member]            
Tax Credit Carryforward, Capitalized 5,400          
Research Tax Credit Carryforward [Member] | Federal [Member]            
Tax Credit Carryforward, Amount 3,900          
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member]            
Tax Credit Carryforward, Amount $ 5,000