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Note 7 - Deferred Compensation and Long-term Incentive Plans (Tables)
6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits by Title of Individual and Type of Deferred Compensation [Table Text Block]
   

Three Months Ended

June 30,

   

Six Months Ended

June 30,

 
   

2014

   

2013

   

2014

   

2013

 

Compensation expense

  $ 377     $ 352     $ 1,077     $ 686