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Note 10 - Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2014
Accrued Liabilities [Abstract]  
Schedule of Accrued Liabilities [Table Text Block]
    December 31,  
   

2014

   

2013

 

Salaries, wages, employment taxes and withholdings

  $ 2,758     $ 4,696  

Employee benefit plans

    1,437       1,244  

Income, property and other taxes

    2,439       532  

Deferred revenue

    6,120       12,357  

Other

    6,021       4,977  
    $ 18,775     $ 23,806