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Note 5 - Costs and Estimated Earnings and Billings on Uncompleted Contracts (Details) - Net Amount of Costs and Estimated Earning on Uncompleted Contracts Above (Below) Billings (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Net Amount of Costs and Estimated Earning on Uncompleted Contracts Above (Below) Billings [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 33,403	$ 11,684
Billings in excess of costs and estimated earnings on uncompleted contracts	(25,649)us-gaap_BillingsInExcessOfCostCurrent	(31,576)us-gaap_BillingsInExcessOfCostCurrent
Net amount of costs and estimated earnings on uncompleted contracts above (below) billings	$ 7,754us-gaap_BillingsInExcessOfCost	$ (19,892)us-gaap_BillingsInExcessOfCost

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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