Note 9 - Stock Options & Share-based plan Share-based Compensation (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2014
Share-based Compensation [Abstract]
Share-based compensation expense related to stock options	$ 15,298	$ 26,548
Stock options exercised		9,600
Proceeds generated from stock options exercised		25,575
Other receivables, stock options exercised		$ 7,161

Other receivable generated in relation to stock options being exercised.

No definition available.

Name:	hrt_Otherreceivablesstockoptionsexercised
Namespace Prefix:	hrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration