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Note 10 - Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2013
Accrued Liabilities [Abstract]  
Schedule of Accrued Liabilities [Table Text Block]
    December 31,   
   

2013

    2012  

Salaries, wages, employment taxes and withholdings

  $ 4,696     $ 3,385  

Employee benefit plans

    1,244       1,121  

Income, property and other taxes

    532       472  

Deferred revenue

    12,357       13,357  

Other

    4,977       3,653  
    $ 23,806     $ 21,988