Note 8 - Convertible Notes Payable at Fair Value - Convertible Debt (Details) (Parentheticals) € in Thousands, $ in Thousands	Mar. 31, 2025 EUR (€)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Instrument, Face Amount \| $		$ 29,656	$ 27,656
Convertible Notes Due December 7, 2023 [Member]
Debt Instrument, Face Amount \| €	€ 29,656

Face (par) amount of debt instrument at time of issuance.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant