SHAREHOLDERS’ EQUITY - Stock Issued for Settlement (Details) - Settlement of Iroquois Lawsuit - shares	Feb. 02, 2017	Dec. 31, 2016
SHAREHOLDERS’ EQUITY
Number of shares will issue to the plaintiffs (in shares)		600,000
Stock issued for legal settlement (in shares)	600,000

Represents the number of shares issued during the period as a result of stock issuance settlement.

No definition available.

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