Note 2 - Revision of Previously Issued Financial Statements (Details Textual) $ in Millions	3 Months Ended
	Sep. 30, 2018 USD ($)	Jun. 01, 2013
Canada, Dollars
Foreign Currency Exchange Rate, Translation		0.9646
Understatement of Accumulated Depreciation, Depletion and Amortization [Member] | Period from June 01, 2013 Through June 30, 2018 [Member]
Prior Period Reclassification Adjustment	$ 35.5
Overstatement of Accumulated Depreciation, Depletion and Amortization [Member] | Period from June 01, 2013 Through June 30, 2018 [Member]
Prior Period Reclassification Adjustment	$ 14.2