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Note 11 - Income Taxes - Open Income Tax Years (Details)	12 Months Ended
	Jun. 30, 2025
Internal Revenue Service (IRS) [Member] \| Minimum [Member]
Open Tax Year	2022
Internal Revenue Service (IRS) [Member] \| Maximum [Member]
Open Tax Year	2025
Canada Revenue Agency [Member] \| Minimum [Member]
Open Tax Year	2021
Canada Revenue Agency [Member] \| Maximum [Member]
Open Tax Year	2025
Federal Ministry of Finance, Germany [Member] \| Minimum [Member]
Open Tax Year	2021
Federal Ministry of Finance, Germany [Member] \| Maximum [Member]
Open Tax Year	2025
Portuguese Tax Authority [Member] \| Minimum [Member]
Open Tax Year	2023
Portuguese Tax Authority [Member] \| Maximum [Member]
Open Tax Year	2025
His Majesty's Revenue and Customs (HMRC) [Member] \| Minimum [Member]
Open Tax Year	2021
His Majesty's Revenue and Customs (HMRC) [Member] \| Maximum [Member]
Open Tax Year	2025