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Note 11 - Line of Credit and Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
   
As of December 31,
 
   
2014
   
2013
 
Credit facility
  $ 34,601     $ 7,808  
Mortgage due monthly through June 2016
    116       189  
Notes payable for transportation and construction equipment
    3,269       468  
      37,986       8,465  
Less current maturities of long-term debt
    (965 )     (134 )
Total long-term debt
  $ 37,021     $ 8,331  
Schedule of Maturities of Long-term Debt [Table Text Block]
Years Ending
December 31,
 
Amount
 
2015
  $ 965  
2016
    35,499  
2017
    710  
2018
    553  
2019
    259  
Thereafter
    -  
    $ 37,986