Note 11 - Stock Option Plans (Details) - Employee Stock Option Activity (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Employee Stock Plan 2001 [Member]
Note 11 - Stock Option Plans (Details) - Employee Stock Option Activity [Line Items]
Options Outstanding	146,200	156,400
Options Outstanding, Weighted Average Exercise Price Per Share (in Dollars per share)	$ 10.00	$ 10.00
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	2 years 215 days
Options exercisable	146,200
Options exercisable, Weighted Average Exercise Price Per Share (in Dollars per share)	$ 10.00
Options exercisable, Weighted Average Remaining Contractual Term (Years)	2 years 215 days
Options expired	(10,200)
Options expired, Weighted Average Exercise Price Per Share (in Dollars per share)	$ 10.00
Stock Incentive Plan 2006 [Member]
Note 11 - Stock Option Plans (Details) - Employee Stock Option Activity [Line Items]
Options Outstanding	2,803,599	3,251,493
Options Outstanding, Weighted Average Exercise Price Per Share (in Dollars per share)	$ 5.02	$ 4.83
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	7 years 240 days
Options Outstanding, Aggregate Intrinsic Value (in Dollars)	$ 4,522,637
Options granted	204,250
Options granted (in Dollars per share)	$ 7.36
Options exercised	(381,595)
Options exercised, Weighted Average Exercise Price Per Share (in Dollars per share)	$ 4.37
Options forfeited	(220,584)
Options forfeited (in Dollars per share)	$ 5.24
Options exercisable	1,226,384
Options exercisable, Weighted Average Exercise Price Per Share (in Dollars per share)	$ 5.27
Options exercisable, Weighted Average Remaining Contractual Term (Years)	7 years 83 days
Options exercisable, Aggregate Intrinsic Value (in Dollars)	1,981,877
Options expired	(49,965)
Options expired, Weighted Average Exercise Price Per Share (in Dollars per share)	$ 6.61
Non Employee Stock Plan 2001 [Member]
Note 11 - Stock Option Plans (Details) - Employee Stock Option Activity [Line Items]
Options Outstanding	410,000	450,000
Options Outstanding, Weighted Average Exercise Price Per Share (in Dollars per share)	$ 5.85	$ 5.85
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	1 year 208 days
Options Outstanding, Aggregate Intrinsic Value (in Dollars)	159,900
Options exercised	(40,000)
Options exercised, Weighted Average Exercise Price Per Share (in Dollars per share)	$ 5.85
Options exercisable	410,000
Options exercisable, Weighted Average Exercise Price Per Share (in Dollars per share)	$ 5.85
Options exercisable, Weighted Average Remaining Contractual Term (Years)	1 year 208 days
Options exercisable, Aggregate Intrinsic Value (in Dollars)	$ 159,900