Note 5 - Stock-Based Compensation (Detail) - Exercisable Options by Exercise Price (USD $)	3 Months Ended
	Mar. 31, 2013
Stock Options Exercisable (in Shares)	1,062,671
Exercisable - Weighted Average Exercise Price	$ 1.17
Range $.55 - $1.00 (Member) | Exercisable [Member]
Range of Exercise Prices - Lower Limit	$ 0.55
Range of Exercise Prices - Upper Limit	$ 1.00
Range $.55 - $1.00 (Member)
Stock Options Exercisable (in Shares)	212,000
Exercisable - Weighted Average Exercise Price	$ 0.75
Range $1.01 - $1.50 (Member) | Exercisable [Member]
Range of Exercise Prices - Lower Limit	$ 1.01
Range of Exercise Prices - Upper Limit	$ 1.50
Range $1.01 - $1.50 (Member)
Stock Options Exercisable (in Shares)	700,671
Exercisable - Weighted Average Exercise Price	$ 1.19
Range $1.51 - $1.74 (Member) | Exercisable [Member]
Range of Exercise Prices - Lower Limit	$ 1.51
Range of Exercise Prices - Upper Limit	$ 1.74
Range $1.51 - $1.74 (Member)
Stock Options Exercisable (in Shares)	150,000
Exercisable - Weighted Average Exercise Price	$ 1.67