Note 10 - Income Taxes - Open Income Tax Years (Details)	12 Months Ended
	Jun. 30, 2018
Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Open Tax Year	2015
Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Open Tax Year	2018
Canada Revenue Agency [Member] | Earliest Tax Year [Member]
Open Tax Year	2014
Canada Revenue Agency [Member] | Latest Tax Year [Member]
Open Tax Year	2018
Federal Ministry of Finance, Germany [Member] | Earliest Tax Year [Member]
Open Tax Year	2016
Federal Ministry of Finance, Germany [Member] | Latest Tax Year [Member]
Open Tax Year	2018
Revenue Commissioners, Ireland [Member] | Earliest Tax Year [Member]
Open Tax Year	2016
Revenue Commissioners, Ireland [Member] | Latest Tax Year [Member]
Open Tax Year	2018
Portuguese Tax Authority [Member] | Earliest Tax Year [Member]
Open Tax Year	2014
Portuguese Tax Authority [Member] | Latest Tax Year [Member]
Open Tax Year	2018
Her Majesty's Revenue and Customs (HMRC) [Member] | Earliest Tax Year [Member]
Open Tax Year	2016
Her Majesty's Revenue and Customs (HMRC) [Member] | Latest Tax Year [Member]
Open Tax Year	2018