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Note 7 - Property and Equipment (Detail) - Property and equipment are summarized as follows (in thousands): (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, plant and equipment	$ 165,851	$ 154,761
Less accumulated depreciation	(63,543)	(71,332)
	102,308	83,429
Construction Equipment [Member]
Property, plant and equipment	130,014	125,222
Transportation Equipment [Member]
Property, plant and equipment	19,266	17,963
Building [Member]
Property, plant and equipment	10,176	4,729
Office Equipment [Member]
Property, plant and equipment	1,279	1,077
Construction in Progress [Member]
Property, plant and equipment		2,544
Land [Member]
Property, plant and equipment	4,916	3,026
Water Rights [Member]
Property, plant and equipment	$ 200	$ 200