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Note 4 - Property and Equipment (Details) - Property and equipment are summarized as follows (amounts in thousands): (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment $ 166,778 $ 165,851
Less accumulated depreciation (69,280) (63,543)
97,498 102,308
Construction Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment 129,822 130,014
Transportation Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment 19,782 19,266
Building [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment 10,509 10,176
Office Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment 1,529 1,279
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment 4,936 4,916
Water Rights [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment $ 200 $ 200