Note 5 - Stock-Based Compensation (Details) - Options Outstanding and Exercisable (USD $)	6 Months Ended
	Jun. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding (in Shares)	2,582,000
Weighted Average Exercise Price	$ 1.09
Weighted Average Remaining Contractual Life	8 years 36 days
Range $.55 - $1.00 (Member)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding (in Shares)	218,000
Weighted Average Exercise Price	$ 0.76
Weighted Average Remaining Contractual Life	5 years 120 days
Range $.55 - $1.00 (Member) | Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Limit	$ 0.55
Range $.55 - $1.00 (Member) | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Upper Limit	$ 1.00
Range $1.01 - $1.50 (Member)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding (in Shares)	2,203,000
Weighted Average Exercise Price	$ 1.09
Weighted Average Remaining Contractual Life	8 years 146 days
Range $1.01 - $1.50 (Member) | Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Limit	$ 1.01
Range $1.01 - $1.50 (Member) | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Upper Limit	$ 1.50
Range $1.51 to $1.68 (Member)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding (in Shares)	161,000
Weighted Average Exercise Price	$ 1.67
Weighted Average Remaining Contractual Life	7 years 240 days
Range $1.51 to $1.68 (Member) | Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Limit	$ 1.51
Range $1.51 to $1.68 (Member) | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Upper Limit	$ 1.68