Note 10 - Discontinued Operations Additional Information (Details) (USD $)	6 Months Ended
Jun. 30, 2014	Dec. 31, 2013
Discontinued Operations Information [Abstract]
Performance guarantee obligation	$ 0	$ 1,000,000
Restricted cash that secured performance obligation		1,000,000
Reduction of restricted cash offset by performance guarantee	975,430
Other income, in relation to performance gaurantee obligation	$ 24,570

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

No definition available.

Name:	hrt_Restrictedcashcurrent
Namespace Prefix:	hrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant