Note 3 - Revenue Recognition (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 13, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Contract With Customer, Liability, Revenue Recognized Including Opening Balance		$ 0	$ 119	$ 0	$ 233
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