Note 13 - Stock-based Compensation (Detail) - Exercise Price and Remaining Life Information about Options Exercisable (USD $)	12 Months Ended
	Dec. 31, 2012
Shares exercisable (in Shares)	1,609,500
Weighted average remaining contractual life	2 years 237 days
Weighted average exercise price	$ 0.64
Range 1 [Member]
Exercise price range, lower limit	$ 1.24
Exercise price range, upper limit	$ 1.30
Shares exercisable (in Shares)	413,500
Weighted average remaining contractual life	197 days
Weighted average exercise price	$ 1.26
Range 2 [Member]
Exercise price range, lower limit	$ 0.70
Exercise price range, upper limit	$ 1.23
Shares exercisable (in Shares)	93,000
Weighted average remaining contractual life	1 year 73 days
Weighted average exercise price	$ 0.74
Range 3 [Member]
Exercise price range, lower limit	$ 0.23
Exercise price range, upper limit	$ 0.69
Shares exercisable (in Shares)	1,103,000
Weighted average remaining contractual life	3 years 36 days
Weighted average exercise price	$ 0.40