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Note 4 - Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2012
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
   
Restricted
Stock
   
Options
 
Outstanding, December 31, 2011
    1,438,131        1,210,816  
Granted
    274,088        228  
Vested
    (744,672 )        
Exercised
           
Forfeited
    (44,164 )       (26,855 )
Canceled or expired
           
Outstanding, June 30, 2012
    923,383        1,184,189