Note 19 - Related Party Transactions (Details Textual) - Armco do Brasil S.A. [Member] - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Related Party Transaction, Purchases from Related Party	$ 5,100,000	$ 3,200,000	$ 4,100,000
Accounts Payable, Related Parties	$ 200,000	$ 0