Note 10 - Shareholders Equity (Detail) - Options Outstanding and Exercisable (USD $)	12 Months Ended
	Dec. 31, 2012
Number of Options Outstanding (in Shares)	2,184,583
Options Outstanding, Weighted Average Remaining Contactual Life	6 years 255 days
Options Outstanding, Weighted Average Exercise Price	$ 2.20
Number of Options Exercisable (in Shares)	1,494,063
Options Exercisable, Weighted Average Exercise Price	$ 2.87
Exercise Price from $0.26 to $0.17 [Member] | Minimum [Member]
Range of Exercise Prices	$ 0.26
Exercise Price from $0.26 to $0.17 [Member] | Maximum [Member]
Range of Exercise Prices	$ 0.71
Exercise Price from $0.26 to $0.17 [Member]
Number of Options Outstanding (in Shares)	729,500
Options Outstanding, Weighted Average Remaining Contactual Life	8 years 73 days
Options Outstanding, Weighted Average Exercise Price	$ 0.52
Number of Options Exercisable (in Shares)	341,279
Options Exercisable, Weighted Average Exercise Price	$ 0.56
Exercise Price from $1.00 to $1.40 [Member] | Minimum [Member]
Range of Exercise Prices	$ 1.00
Exercise Price from $1.00 to $1.40 [Member] | Maximum [Member]
Range of Exercise Prices	$ 1.40
Exercise Price from $1.00 to $1.40 [Member]
Number of Options Outstanding (in Shares)	803,333
Options Outstanding, Weighted Average Remaining Contactual Life	7 years 6 months
Options Outstanding, Weighted Average Exercise Price	$ 1.16
Number of Options Exercisable (in Shares)	501,034
Options Exercisable, Weighted Average Exercise Price	$ 1.07
Exercise Price from $2.00 to $3.35 [Member] | Minimum [Member]
Range of Exercise Prices	$ 2.00
Exercise Price from $2.00 to $3.35 [Member] | Maximum [Member]
Range of Exercise Prices	$ 3.35
Exercise Price from $2.00 to $3.35 [Member]
Number of Options Outstanding (in Shares)	248,750
Options Outstanding, Weighted Average Remaining Contactual Life	5 years
Options Outstanding, Weighted Average Exercise Price	$ 2.12
Number of Options Exercisable (in Shares)	248,750
Options Exercisable, Weighted Average Exercise Price	$ 2.12
Exercise Price from $4.91 to $6.45 [Member] | Minimum [Member]
Range of Exercise Prices	$ 4.91
Exercise Price from $4.91 to $6.45 [Member] | Maximum [Member]
Range of Exercise Prices	$ 6.45
Exercise Price from $4.91 to $6.45 [Member]
Number of Options Outstanding (in Shares)	167,000
Options Outstanding, Weighted Average Remaining Contactual Life	4 years 6 months
Options Outstanding, Weighted Average Exercise Price	$ 6.04
Number of Options Exercisable (in Shares)	167,000
Options Exercisable, Weighted Average Exercise Price	$ 6.04
Exercise Price from $7.00 to $11.66 [Member] | Minimum [Member]
Range of Exercise Prices	$ 7.00
Exercise Price from $7.00 to $11.66 [Member] | Maximum [Member]
Range of Exercise Prices	$ 11.66
Exercise Price from $7.00 to $11.66 [Member]
Number of Options Outstanding (in Shares)	236,000
Options Outstanding, Weighted Average Remaining Contactual Life	2 years 255 days
Options Outstanding, Weighted Average Exercise Price	$ 8.29
Number of Options Exercisable (in Shares)	236,000
Options Exercisable, Weighted Average Exercise Price	$ 8.29