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Note 9 - Line of Credit and Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
    As of December 31,
    2016   2015
Equipment-based Facility   $
3,532
     $
17,957
  
Less deferred loan costs    
(803
 )    
(1,119
 )
Equipment-based Facility, Net    
2,729
      
16,838
  
Notes payable for transportation and construction equipment and other    
2,665
      
3,342
  
     
5,394
      
20,180
  
                 
Current maturities of long-term debt    
4,648
      
5,192
  
Less current deferred loan costs    
(803
 )    
(336
 )
Less current maturities of long-term debt, net    
(3,845
 )    
(4,856
 )
Total long-term debt   $
1,549
     $
15,324
  
Schedule of Maturities of Long-term Debt [Table Text Block]
  Years Ending
December 31,		  
Amount
  
  2017   $
3,845
 
  
  2018    
920
 
  
  2019    
566
 
  
  2020    
59
 
  
  2021    
4
 
  
  Thereafter    
--
 
  
      $
5,394