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Note 6 - Construction Joint Ventures (Details) - Noncontrolling Venture Partner Income (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Income Statements, Captions [Line Items]
Revenues	$ 153,611,000us-gaap_Revenues	$ 189,275,000us-gaap_Revenues	$ 194,806,000us-gaap_Revenues	$ 134,538,000us-gaap_Revenues	$ 125,916,000us-gaap_Revenues	$ 185,935,000us-gaap_Revenues	$ 133,350,000us-gaap_Revenues	$ 111,035,000us-gaap_Revenues	$ 672,230,000us-gaap_Revenues	$ 556,236,000us-gaap_Revenues	$ 630,507,000us-gaap_Revenues
Income before tax	(5,875,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(1,671,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,473,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	480,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(37,333,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,715,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(25,967,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(7,219,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(4,593,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(68,804,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Corporate Joint Venture [Member]
Condensed Income Statements, Captions [Line Items]
Revenues									51,015,000us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember	135,699,000us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember	438,756,000us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember
Income before tax									3,606,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember	(20,758,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember	95,765,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember
Share of revenues									20,243,000us-gaap_IncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember	54,096,000us-gaap_IncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember	82,519,000us-gaap_IncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember
Share of income before tax									$ 2,111,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember	$ (11,088,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember	$ 12,424,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember

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Amount of Income (Loss) attributable to the noncontrolling interest.

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-Publisher FASB

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-SubTopic 10

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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