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Note 5 - Property and Equipment (Details Textual) € in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2025 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 USD ($)
Property, Plant and Equipment [Line Items]
Consideration for equipment and services pursuant to the MESA and SOWs \| €		€ 49.0
Other [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense \| $	$ 0		$ 0