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Note 6 - Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended
Sep. 30, 2013
May 31, 2013
Dec. 31, 2012
Dec. 31, 2013
program
Dec. 31, 2011
Dec. 31, 2010
Feb. 28, 2014
Subsequent Event [Member]
Dec. 31, 2013
Through the Open Market Repurchase Program [Member]
Dec. 31, 2013
In Connection with Equity Compensation Programs [Member]
Dec. 31, 2013
Stock Awards [Member]
Dec. 31, 2012
Stock Awards [Member]
Dec. 31, 2011
Stock Awards [Member]
Dec. 31, 2010
Stock Awards [Member]
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2013
2013 Employee Plan [Member]
Dec. 31, 2013
2013 Employee Plan [Member]
Stock Awards [Member]
Dec. 31, 2013
2009 Employee Plan [Member]
Dec. 31, 2013
2009 Employee Plan [Member]
Stock Awards [Member]
Dec. 31, 2013
2006 Employee Plan [Member]
Dec. 31, 2013
2006 Employee Plan [Member]
Stock Awards [Member]
Dec. 31, 2013
2011 Director Plan [Member]
Dec. 31, 2013
2011 Director Plan [Member]
Deferred Stock Units [Member]
Dec. 31, 2013
2006 Director Plan [Member]
Deferred Stock Units [Member]
Dec. 31, 2013
2001 Director Plan [Member]
Deferred Stock Units [Member]
Dec. 31, 2013
Inducement Grants [Member]
Jun. 30, 2008
Inducement Grants [Member]
Chief Executive Officer [Member]
Jun. 30, 2008
Inducement Grants [Member]
Performance Shares [Member]
Chief Executive Officer [Member]
Jun. 30, 2008
Inducement Grants [Member]
Restricted Stock [Member]
Chief Executive Officer [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) [Line Items]                                                            
Stock Repurchase Program, Authorized Amount $ 10.0 $ 10.0 $ 5.0       $ 20.0   $ 10.0                                          
Stock Repurchased During Period, Shares (in Shares)               1,102,454 115,931                                          
Stock Repurchased During Period, Value               $ 25.0 $ 2.6                                          
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)               $ 22.68 $ 22.84                                          
Number of Equity-Based Compensation Plans       3                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)                                 2,895,000           200,000              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                   555,025 698,869 643,117 888,855         36,528   515,844   2,653   87,337 59,818 67,300        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                                                       118,397    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                           435,025 239,523 168,018                         52,784 103,092
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     1,216,809 1,208,824 1,107,712 1,198,516                         653,065   437,362           118,397