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Note 4 - Stock-based Compensation (Detail) - Restricted Stock and Stock Options
6 Months Ended
Jun. 30, 2012
Restricted Stock [Member]
 
Outstanding, December 31, 2011 1,438,131
Granted 274,088
Vested (744,672)
Forfeited (44,164)
Outstanding, June 30, 2012 923,383
Stock Options [Member]
 
Outstanding, December 31, 2011 1,210,816
Granted 228
Forfeited (26,855)
Outstanding, June 30, 2012 1,184,189