Note 11 - Stock-based Compensation (Detail) - Stock Option Activities (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012 Beginning of Period [Member]	Dec. 31, 2011 Beginning of Period [Member]	Dec. 31, 2013 End of Period [Member]	Mar. 31, 2012 End of Period [Member]
Outstanding				5,836,500	5,171,500	4,585,500	5,823,500
Outstanding, weighted average exercise price per share (in Dollars per share)				$ 0.45	$ 0.56	$ 0.46	$ 0.55
Granted	0	675,000	0
Granted (in Dollars per share)		$ 0.46	$ 0
Exercised		0	0
Exercised (in Dollars per share)		$ 0	$ 0
Forfeited		(23,000)	(1,251,000)
Forfeited (in Dollars per share)		$ 1.10	$ 0.43
Outstanding				5,836,500	5,171,500	4,585,500	5,823,500
Outstanding, weighted average exercise price per share (in Dollars per share)				$ 0.45	$ 0.56	$ 0.46	$ 0.55