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Note 7 - Common Stock Warrants and Earn-out Liability (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jul. 16, 2021
Mar. 30, 2025
Mar. 31, 2024
Apr. 03, 2022
Dec. 31, 2024
Oct. 09, 2021
Class of Warrant or Right, Outstanding (in shares)           14,666,644
Warrant Liability   $ 740     $ 813  
Fair Value Adjustment of Warrants   (73) $ (3,127)      
Business Combination, Contingent Consideration, Liability, Noncurrent   963     1,148  
Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease)   (185) (649)      
Empower Sponsor Holdings LLC [Member]            
Business Combination, Contingent Consideration, Liability, Noncurrent   963     $ 1,148  
Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease)   $ (185) $ (649)      
Empower Sponsor Holdings LLC [Member] | Earn Out Shares [Member]            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) 2,187,500          
Empower Sponsor Holdings LLC [Member] | Tranche One [Member]            
Stock Issued During Period, Shares, Acquisitions (in shares)       1,093,750    
Stock Issued During Period, Value, Acquisitions       $ 14,689    
Public Warrants [Member]            
Class of Warrant or Right, Outstanding (in shares)           9,999,977
Public Warrants [Member] | Measurement Input, Share Price [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 0.01
Share Price (in dollars per share)           18
Public Warrants [Member] | Measurement Input Share Price1 [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           0.1
Share Price (in dollars per share)           $ 10
Private Placement Warrants [Member]            
Class of Warrant or Right, Outstanding (in shares)           4,666,667
Private and Public Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)           1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 11.5
Warrants and Rights Outstanding, Term (Year)           5 years