SHAREHOLDERS’ EQUITY - Awards Issued in Lieu of Cash Bonus (Details)	12 Months Ended
Jun. 30, 2017 shares
SHAREHOLDERS’ EQUITY
Stock issued in lieu of cash bonus (in shares)	536,091

Number of of shares issued during the period in lieu of cash bonus.

No definition available.

Name:	hdy_StockIssuedDuringPeriodSharesCashBonus
Namespace Prefix:	hdy_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration