Note 2 - Operating Matters & Liquidity (Details) (USD $)	Jun. 26, 2014
Operating Matters and Liquidity [Abstract]
New equipment line of credit	$ 1,000,000

The Company entered into a new equipment line of credit, on June 26, 2014, under the Company's multi-year credit facility entered into on March 29, 2013 with a Massachusetts bank.

No definition available.

Name:	hrt_Equipmentlineofcredit2014
Namespace Prefix:	hrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant