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Note 6 - Property and Equipment (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    March 31,
2017
  December 31,
2016
Construction equipment   $
122,097
    $
121,441
 
Transportation equipment    
18,161
     
19,017
 
Buildings    
12,786
     
12,771
 
Office equipment    
3,108
     
3,108
 
Leasehold improvement    
914
     
914
 
Construction in progress    
100
     
313
 
Land    
3,509
     
3,509
 
Water rights    
200
     
200
 
     
160,875
     
161,273
 
Less accumulated depreciation    
(95,054
)    
(93,146
)
Total property and equipment, net   $
65,821
    $
68,127