Note 9 - Discontinued Operations (Details) - Operating Results for Discontinued Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 2,444	$ 3,041	$ 8,120	$ 5,757
Gross profit	(2,161)	208	(3,240)	321
Operating expenses	1,159	499	1,618	900
Operating loss	(8,339)	(291)	(9,877)	(580)
Loss before tax benefits	(8,128)	(430)	(9,695)	(759)
Tax benefits	3,151	176	3,797	312
Net loss	(4,977)	(253)	(5,898)	(447)
Welding Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Closure charges of welding business	$ 5,019		$ 5,019