Note 3 - Share-Based Compensation (Detail) - Stock option activity (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Options outstanding as of December 31, 2012		1,790,002	2,145,003
Options outstanding as of December 31, 2012 (in Dollars per share)		$ 1.49
Options outstanding as of December 31, 2012	1 year 288 days	2 years 233 days
Exercised	(35,001)
Exercised (in Dollars per share)	$ 1.19
Canceled/expired/forfeited	(50,000)
Canceled/expired/forfeited (in Dollars per share)	$ 1.60
Options outstanding as of March 31, 2013	1,705,001		2,145,003
Options outstanding as of March 31, 2013 (in Dollars per share)	$ 1.50
Options outstanding as of March 31, 2013	1 year 288 days	2 years 233 days
Options exercisable as of March 31, 2013	1,360,001
Options exercisable as of March 31, 2013 (in Dollars per share)	$ 1.48
Options exercisable as of March 31, 2013	1 year 219 days