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Note 5 - Stock-based Compensation (Details) - Summary of restricted shares (Incentive Plan 2007 [Member], USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Incentive Plan 2007 [Member]
   
Restricted stock - common:    
Outstanding - beginning of period 0 0
Outstanding - beginning of period (in Dollars per share) $ 0 $ 0
Granted 382,062 432,396
Granted (in Dollars per share) $ 5.20 $ 1.65
Vested (107,224) 0
Vested (in Dollars per share) $ 7.16 $ 0
Outstanding - end of period 274,838 432,396
Outstanding - end of period (in Dollars per share) $ 4.43 $ 1.65