Note 11 - Discontinued Operations (Details) - Operating Results for Discontinued Operations (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Closure charges of welding business	$ 100
Bayou Welding Works [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	9,763	11,132	12,819
Gross profit (loss)	(4,255)	(645)	445
Operating expenses	1,973	2,038	1,615
Closure charges of welding business	5,019	0	0
Operating loss	(11,247)	2,683	(1,170)
Loss before tax benefits	(10,731)	(2,904)	(1,206)
Tax benefits	4,270	1,191	619
Net loss	$ (6,461)	$ (1,713)	$ (587)