Note 11 - Stock Based Compensation (Detail) - The following table summarizes information about stock options outstanding (USD $)	12 Months Ended
	Dec. 31, 2012
Number Outstanding	3,061,393
Number Exercisable	1,840,651
Less Than $1.01 [Member]
Number Outstanding	2,226,185
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 219 days
Options Outstanding, Weighted Average Exercise Price (in Dollars per share)	$ 0.51
Number Exercisable	1,672,435
Options Exercisable, Weighted Average Exercise Price (in Dollars per share)	$ 0.51
Range of $1.01 - 2.00 [Member]
Number Outstanding	827,208
Options Outstanding, Weighted Average Remaining Contractual Life (years)	8 years 270 days
Options Outstanding, Weighted Average Exercise Price (in Dollars per share)	$ 1.24
Number Exercisable	165,216
Options Exercisable, Weighted Average Exercise Price (in Dollars per share)	$ 1.24
Range of $2.01 - 4.00 [Member]
Number Outstanding	7,750
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 167 days
Options Outstanding, Weighted Average Exercise Price (in Dollars per share)	$ 3.23
Number Exercisable	2,750
Options Exercisable, Weighted Average Exercise Price (in Dollars per share)	$ 3.23
Greater Than $4.00 [Member]
Number Outstanding	250
Options Outstanding, Weighted Average Remaining Contractual Life (years)	219 days
Options Outstanding, Weighted Average Exercise Price (in Dollars per share)	$ 4.65
Number Exercisable	250
Options Exercisable, Weighted Average Exercise Price (in Dollars per share)	$ 4.65