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Note 9 - 401(k) Profit Sharing, Deferred Compensation and Long-term Incentive Plans (Tables)
12 Months Ended
Dec. 31, 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]

Year Ended December 31,

 

2014

   

2013

   

2012

 

Compensation expense (in millions)

    1.9       1.4       1.2  

Total discretionary contribution (in millions)

    2.4       2.1       1.9  

Guaranteed annual return

    5.25 %     5.25 %     5.90 %