Note 12 - Share-Based Payments (Details) - Summary of Exercise Prices, Weighted Average Remaining Contractual Life and Intrinsic Values of Outstanding Options (USD $)	9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in Shares)	1,007,271	1,052,308	1,407,639	1,385,685	2,117,121	2,148,170
Weighted average exercise price per share ,options outstanding	$ 5.34	$ 4.01	$ 3.80	$ 3.64	$ 2.84	$ 2.56
Weighted average remaining contractual life (years), options outstanding	3 years 146 days
Aggregate intrinsic value, options outstanding (in Dollars)	$ 9,750,282
Number exercisable (in Shares)	732,683			1,049,810
Weighted average exercise price per share, options exercisable	$ 3.84			$ 3.12
Aggregate intrinsic value, options exercisable (in Dollars)	8,140,995
Exercise Price Range 01 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price - lower	$ 2.40
Exercise price - higher	$ 2.40
Number Outstanding (in Shares)	124,750
Weighted average exercise price per share ,options outstanding	$ 2.40
Weighted average remaining contractual life (years), options outstanding	219 days
Aggregate intrinsic value, options outstanding (in Dollars)	1,563,118
Number exercisable (in Shares)	124,750
Weighted average exercise price per share, options exercisable	$ 2.40
Aggregate intrinsic value, options exercisable (in Dollars)	1,563,118
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)	326,263
Weighted average exercise price per share ,options outstanding	$ 2.76
Weighted average remaining contractual life (years), options outstanding	2 years 109 days
Aggregate intrinsic value, options outstanding (in Dollars)	3,970,110
Number exercisable (in Shares)	326,263
Weighted average exercise price per share, options exercisable	$ 2.76
Aggregate intrinsic value, options exercisable (in Dollars)	3,970,110
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)	139,408
Weighted average exercise price per share ,options outstanding	$ 3.01
Weighted average remaining contractual life (years), options outstanding	3 years 36 days
Aggregate intrinsic value, options outstanding (in Dollars)	1,662,210
Number exercisable (in Shares)	115,160
Weighted average exercise price per share, options exercisable	$ 3.02
Aggregate intrinsic value, options exercisable (in Dollars)	1,370,992
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	$ 15.93
Number Outstanding (in Shares)	416,850
Weighted average exercise price per share ,options outstanding	$ 9.01
Weighted average remaining contractual life (years), options outstanding	5 years 36 days
Aggregate intrinsic value, options outstanding (in Dollars)	2,554,844
Number exercisable (in Shares)	166,510
Weighted average exercise price per share, options exercisable	$ 7.58
Aggregate intrinsic value, options exercisable (in Dollars)	$ 1,236,775