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Note 9 - Line of Credit and Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
    As of December 31,
    2015   2014
Equipment-based Facility   $ 17,957     $ --  
Credit Facility     --       34,601  
Notes payable for transportation and construction equipment and other     3,342       3,385  
      21,299       37,986  
Less current maturities of long-term debt     (5,192 )     (965 )
Total long-term debt   $ 16,107     $ 37,021  
Schedule of Debt [Table Text Block]
    As of December 31,  2015
    Carrying Value   Fair Value
         
Equipment-based revolving loan   $ --     $ --  
Equipment-based term loan     17,957       17,957  
Total Equipment-based Facility debt   $ 17,957     $ 17,957  
Schedule of Maturities of Long-term Debt [Table Text Block]
Years Ending December 31,   Amount
2016   $ 5,192  
2017     4,993  
2018     4,868  
2019     6,196  
2020     50  
Thereafter     --  
    $ 21,299