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Note 7 - Construction Joint Ventures (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Corporate Joint Venture [Member] | Noncontrolling Interest [Member]    
Revenues $ 3,780 $ 4,552
Income before tax 258 335
Corporate Joint Venture [Member]    
Revenues 8,804 13,006
Income before tax 535 2,413
Revenues $ 126,567 $ 117,682