Note 11 - Discontinued Operations (Details) - Balance Sheet Data for Discontinued Operations (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Costs and estimated earnings in excess of billings	$ 51,023	$ 55,021
Bayou Welding Works [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets	0	8,356
Total liabilities	0	2,267
Discontinued Operations [Member] | Bayou Welding Works [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restricted cash	0	1,193
Receivables, net	0	4,038
Prepaid expenses and other current assets	0	204
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	0	1,118
Other assets	0	1,803
Accounts payable	0	2,050
Accrued expenses	0	20
Deferred tax liability	$ 0	$ 197