Note 11 - Income Taxes - Open Income Tax Years (Details)	12 Months Ended
	Jun. 30, 2019
Internal Revenue Service (IRS) [Member]
Open Tax Year	2016 2017 2018 2019
Canada Revenue Agency [Member]
Open Tax Year	2015 2016 2017 2018 2019
Federal Ministry of Finance, Germany [Member]
Open Tax Year	2016 2017 2018 2019
Revenue Commissioners, Ireland [Member]
Open Tax Year	2019
Portuguese Tax Authority [Member]
Open Tax Year	2018 2019
Her Majesty's Revenue and Customs (HMRC) [Member]
Open Tax Year	2016 2017 2018 2019