Consolidated Statements of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
General and administrative, share-based payment arrangements	$ 69	$ 182

Share Based Compensation, General and Administrative Expenses

No definition available.

Name:	hdsn_ShareBasedCompensationGeneralAndAdministrativeExpenses
Namespace Prefix:	hdsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration