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Note 12 - Share-Based Payments (Details) - Summary of Exercise Prices, Weighted Average Remaining Contractual Life and Intrinsic Values of Outstanding Options (USD $)
 6 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]            
Number Outstanding (in Shares) 1,052,308 1,107,257 1,407,639 2,117,121 2,168,003 2,148,170
Weighted average exercise price per share ,options outstanding $ 4.01 $ 3.97 $ 3.80 $ 2.84 $ 2.60 $ 2.60
Weighted average remaining contractual life (years), options outstanding 3 years          
Aggregate intrinsic value, options outstanding (in Dollars) $ 8,657,721          
Number exercisable (in Shares) 824,641     1,741,361    
Weighted average exercise price per share, options exercisable $ 3.34     $ 2.40    
Aggregate intrinsic value, options exercisable (in Dollars) 7,338,371          
Exercise Price Range 01 [Member]
            
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]            
Exercise price - lower $ 2.24          
Exercise price - higher $ 2.40          
Number Outstanding (in Shares) 227,092          
Weighted average exercise price per share ,options outstanding $ 2.35          
Weighted average remaining contractual life (years), options outstanding 219 days          
Aggregate intrinsic value, options outstanding (in Dollars) 2,244,993          
Number exercisable (in Shares) 227,092          
Weighted average exercise price per share, options exercisable $ 2.35          
Aggregate intrinsic value, options exercisable (in Dollars) 2,244,993          
Exercise Price Range 02 [Member]
            
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]            
Exercise price - lower $ 2.48          
Exercise price - higher $ 2.80          
Number Outstanding (in Shares) 346,013          
Weighted average exercise price per share ,options outstanding $ 2.76          
Weighted average remaining contractual life (years), options outstanding 2 years 6 months          
Aggregate intrinsic value, options outstanding (in Dollars) 3,280,763          
Number exercisable (in Shares) 346,013          
Weighted average exercise price per share, options exercisable $ 2.76          
Aggregate intrinsic value, options exercisable (in Dollars) 3,280,763          
Exercise Price Range 03 [Member]
            
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]            
Exercise price - lower $ 2.92          
Exercise price - higher $ 3.76          
Number Outstanding (in Shares) 147,891          
Weighted average exercise price per share ,options outstanding $ 3.01          
Weighted average remaining contractual life (years), options outstanding 3 years 146 days          
Aggregate intrinsic value, options outstanding (in Dollars) 1,365,339          
Number exercisable (in Shares) 99,125          
Weighted average exercise price per share, options exercisable $ 3.05          
Aggregate intrinsic value, options exercisable (in Dollars) 910,840          
Exercise Price Range 04 [Member]
            
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]            
Exercise price - lower $ 4.20          
Exercise price - higher $ 10.16          
Number Outstanding (in Shares) 331,312          
Weighted average exercise price per share ,options outstanding $ 6.91          
Weighted average remaining contractual life (years), options outstanding 5 years 36 days          
Aggregate intrinsic value, options outstanding (in Dollars) 1,766,626          
Number exercisable (in Shares) 152,411          
Weighted average exercise price per share, options exercisable $ 6.32          
Aggregate intrinsic value, options exercisable (in Dollars) $ 901,775