Note 10 - Stock-Based Compensation (Detail) - Additional information regarding options outstanding (USD $)	6 Months Ended
	Jun. 30, 2012
Options Outstanding - Shares	4,069,207
Options Outstanding - Weighted Average Remaining Contractual Life (Years)	5 years 332 days
Options Outstanding - Weighted Average Exercise Price (in Dollars per share)	$ 0.51
Options Exercisable - Shares	3,009,677
Options Exercisable -Weighted Average Exercise Price (in Dollars per share)	$ 0.60
Range of $0.15 - $0.37 [Member]
Options Outstanding - Shares	2,223,957
Options Outstanding - Weighted Average Remaining Contractual Life (Years)	8 years 87 days
Options Outstanding - Weighted Average Exercise Price (in Dollars per share)	$ 0.28
Options Exercisable - Shares	1,164,427
Options Exercisable -Weighted Average Exercise Price (in Dollars per share)	$ 0.29
Range of $0.40 - $0.57 [Member]
Options Outstanding - Shares	795,000
Options Outstanding - Weighted Average Remaining Contractual Life (Years)	4 years 105 days
Options Outstanding - Weighted Average Exercise Price (in Dollars per share)	$ 0.49
Options Exercisable - Shares	795,000
Options Exercisable -Weighted Average Exercise Price (in Dollars per share)	$ 0.49
Range of $0.70 - $1.00 [Member]
Options Outstanding - Shares	869,000
Options Outstanding - Weighted Average Remaining Contractual Life (Years)	2 years 65 days
Options Outstanding - Weighted Average Exercise Price (in Dollars per share)	$ 0.90
Options Exercisable - Shares	869,000
Options Exercisable -Weighted Average Exercise Price (in Dollars per share)	$ 0.90
Range of $1.20 - $1.80 [Member]
Options Outstanding - Shares	181,250
Options Outstanding - Weighted Average Remaining Contractual Life (Years)	2 years 102 days
Options Outstanding - Weighted Average Exercise Price (in Dollars per share)	$ 1.56
Options Exercisable - Shares	181,250
Options Exercisable -Weighted Average Exercise Price (in Dollars per share)	$ 1.56