Note 5 - Stock-Based Compensation (Detail) - Options Outstanding and Exercisable (USD $)	3 Months Ended
	Mar. 31, 2013
Stock Options Outstanding (in Shares)	2,721,500
Weighted Average Exercise Price	$ 1.09
Weighted Average Remaining Contractual Life	8 years 14 days
Range $.55 - $1.00 (Member) | Minimum [Member]
Range of Exercise Prices - Lower Limit	$ 0.55
Range $.55 - $1.00 (Member) | Maximum [Member]
Range of Exercise Prices - Upper Limit	$ 1.00
Range $.55 - $1.00 (Member)
Stock Options Outstanding (in Shares)	218,000
Weighted Average Exercise Price	$ 0.76
Weighted Average Remaining Contractual Life	5 years 211 days
Range $1.01 - $1.50 (Member) | Minimum [Member]
Range of Exercise Prices - Lower Limit	$ 1.01
Range $1.01 - $1.50 (Member) | Maximum [Member]
Range of Exercise Prices - Upper Limit	$ 1.50
Range $1.01 - $1.50 (Member)
Stock Options Outstanding (in Shares)	2,353,500
Weighted Average Exercise Price	$ 1.08
Weighted Average Remaining Contractual Life	8 years 102 days
Range $1.51 to $1.68 (Member) | Minimum [Member]
Range of Exercise Prices - Lower Limit	$ 1.51
Range $1.51 to $1.68 (Member) | Maximum [Member]
Range of Exercise Prices - Upper Limit	$ 1.68
Range $1.51 to $1.68 (Member)
Stock Options Outstanding (in Shares)	150,000
Weighted Average Exercise Price	$ 1.67
Weighted Average Remaining Contractual Life	7 years 9 months