Note 6 - Receivables, Net (Tables)
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
    2013     2012  
    (in thousands)   

Trade

  $ 18,689     $ 11,513  

Insurance

    1,806       4,980  

Income tax

    714       871  

Other

    310       236  

Total accounts receivable

    21,519       17,600  

Less allowance for doubtful accounts

    (379 )     (333 )

Receivables, net

  $ 21,140     $ 17,267