Note 3 - Supplemental Balance Sheet Information Schedule of Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Inventories [Abstract]
Raw materials and supplies	$ 22,807	$ 19,680
Work-in-process	13,179us-gaap_InventoryWorkInProcess	8,217us-gaap_InventoryWorkInProcess
Finished products	9,692us-gaap_InventoryFinishedGoods	12,518us-gaap_InventoryFinishedGoods
Construction materials	13,514	18,353
Total	$ 59,192us-gaap_InventoryNet	$ 58,768us-gaap_InventoryNet

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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Carrying amount as of the balance sheet date of unprocessed goods that will be used in the course of a construction project which will become a part of the finished inventory.

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