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Note 4 - Property and Equipment (Tables)
3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
   
March 31,
2015
   
December 31,
2014
 
Construction equipment
  $ 122,410     $ 129,150  
Transportation equipment
    18,166       18,205  
Buildings
    10,796       10,777  
Office equipment
    2,757       2,761  
Leasehold improvement
    894       878  
Construction in progress
    538       387  
Land
    5,530       5,530  
Water rights
    200       200  
      161,291       167,888  
Less accumulated depreciation
    (78,750 )     (80,790 )
    $ 82,541     $ 87,098