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Note 12 - Share-Based Payments (Details) - Details of stock option transactions
 3 Months Ended 9 Months Ended
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
Sep. 30, 2013
AFN
Details of stock option transactions [Abstract]          
Outstanding, beginning of period 8,468,485 8,524,499 8,592,686 8,746,041  
Outstanding, beginning of period (in Dollars per share) $ 0.71 $ 0.62 $ 0.64 $ 0.57 0.91
Granted 90,000 220,000 571,500 769,000  
Granted (in Dollars per share) $ 2.23 $ 1.38 $ 1.97 $ 1.36  
Exercised (2,935,373) (20,187) (3,511,946) (693,340)  
Exercised (in Dollars per share) $ 0.39 $ 0.70 $ 0.41 $ 0.52  
Forfeited (75,624) (56,689) (104,752) (154,064)  
Forfeited (in Dollars per share) $ 1.22 $ 0.83 $ 1.21 $ 0.80  
Expired (4,750) (3,000) (4,750) (3,014)  
Expired (in Dollars per share) $ 0.36 $ 0.44 $ 0.36 $ 0.44  
Outstanding, end of period 5,542,738 8,664,623 5,542,738 8,664,623  
Outstanding, end of period (in Dollars per share) $ 0.91 $ 0.64 $ 0.91 $ 0.64 0.91
Options exercisable, end of period 4,199,238 7,160,766 4,199,238 7,160,766  
Options exercisable, end of period (in Dollars per share) $ 0.78 $ 0.57 $ 0.78 $ 0.57