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Note 3 - Revenue Recognition (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 13, 2025
Mar. 31, 2025
Mar. 31, 2024
Contract With Customer, Liability, Revenue Recognized Including Opening Balance   $ 0 $ 114
Customer Warrant [Member] | Subsidiary of Amazon [Member]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 7,945,399    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 23.6956    
Warrants and Rights Outstanding, Term (Year) 10 years    
Class of Warrant or Right, Exercisable at Issuance, Number of Securities Called by Warrants or Rights (in shares) 1,324,233    
Class of Warrant or Right, Unvested, Number of Securities Called by Warrants or Rights (in shares) 6,621,166    
Class of Warrants or Rights, Vesting Covenant, Purchases of Products Benchmark $ 4,000,000    
Class of Warrant or Right, Vested (in shares) 1,324,233    
Class of Warrant or Right, Vested at Issuance, Grant Date Fair Value (in dollars per share) $ 12.64    
Customer Warrant [Member] | Subsidiary of Amazon [Member] | Other Current Assets [Member]      
Class of Warrant or Right, Vested, Aggregate Grant Date Fair Value $ 1,700    
Customer Warrant [Member] | Subsidiary of Amazon [Member] | Other Noncurrent Assets [Member]      
Class of Warrant or Right, Vested, Aggregate Grant Date Fair Value $ 15,100