Note 2 - Acquisitions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	8 Months Ended	12 Months Ended
	Aug. 25, 2011	Dec. 31, 2012	Jun. 29, 2013	Mar. 30, 2013	Mar. 07, 2013	Dec. 31, 2011
Note 2 - Acquisitions (Details) [Line Items]
Payments to Acquire Businesses, Gross	$ 7.0
Business Acquisition Contingent Consideration Potential Cash Payment 1	3.5			0.5	3.0
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	2.6	3.5	3.5
Common Stock, Par or Stated Value Per Share (in Dollars per share)	$ 0.10	$ 0.10	$ 0.10			$ 0.10
Business Acquisition, Cost of Acquired Entity, Adjustment		0.3
Business Acquisition, Equity Interest Issued or Issuable, Description		As a result of Rio's 2011 Adjusted EBITDA multiplied by three equaling or exceeding $23.0 million and the release of certain shares previously being held back in connection with potential tax indemnification claims, during 2012, the Company issued to a representative of the Rio equity holders a total of $3.0 million of Hampshire Common Stock pursuant to the terms of the merger agreement.
Contingent Consideration, Indemnification Holdback					3.0
Contingent Consideration, Tax Holdback			0.5
Potential Post Closing Price [Member]
Note 2 - Acquisitions (Details) [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	6.5	6.5
Equity Holders [Member]
Note 2 - Acquisitions (Details) [Line Items]
Payments to Acquire Businesses, Gross		1.4
Former Equity Holders [Member]
Note 2 - Acquisitions (Details) [Line Items]
Payments to Acquire Businesses, Gross		1.8
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		3.0
Contingent Consideration, EBITDA Adjustment		$ 3.0