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Note 12 - Share-Based Payments (Details) - Details of stock option transactions for the three months ended June 30, 2011 and June 30, 2010 are (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Details of stock option transactions for the three months ended June 30, 2011 and June 30, 2010 are [Abstract]        
Outstanding, beginning of period 8,672,016 8,458,699 8,592,686 8,746,041
Outstanding, beginning of period (in Dollars per share) $ 0.65 $ 0.57 $ 0.64 $ 0.57
Granted 331,500 504,000 481,500 549,000
Granted (in Dollars per share) $ 2.14 $ 1.38 $ 1.92 $ 1.35
Exercised (519,716) (378,936) (576,573) (673,153)
Exercised (in Dollars per share) $ 0.54 $ 0.58 $ 0.55 $ 0.52
Forfeited (15,315) (59,250) (29,128) (97,375)
Forfeited (in Dollars per share) $ 1.32 $ 0.74 $ 1.19 $ 0.78
Expired   (14)   (14)
Expired (in Dollars per share)   $ 0.49   $ 0.49
Outstanding, end of period 8,468,485 8,524,499 8,468,485 8,524,499
Outstanding, end of period (in Dollars per share) $ 0.71 $ 0.62 $ 0.71 $ 0.62
Options exercisable, end of period 6,965,445 6,864,749 6,965,445 6,864,749
Options exercisable, end of period (in Dollars per share) $ 0.60 $ 0.55 $ 0.60 $ 0.55