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Note 3 - Cost and Estimated Earnings on Uncompleted Contracts (Details) - Cost and Estimated Earnings on Uncompleted Contracts Included in Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Cost and Estimated Earnings on Uncompleted Contracts Included in Consolidated Balance Sheets [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 27,793	$ 21,217
Billings in excess of costs and estimated earnings on uncompleted contracts	(24,724)us-gaap_BillingsInExcessOfCostCurrent	(7,903)us-gaap_BillingsInExcessOfCostCurrent
Total	$ 3,069us-gaap_UnbilledContractsReceivable	$ 13,314us-gaap_UnbilledContractsReceivable

Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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