Note 9 - Discontinued Operations (Details) - Operating Results for Discontinued Operations (Welding Business [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Welding Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 0	$ 5,676
Gross profit	(21)	(1,078)
Operating expenses	202	459
Operating loss	(223)	(1,537)
Other expenses	0	30
Loss before tax benefits	(223)	(1,567)
Tax benefits	91	646
Net loss	$ (132)	$ (921)