Note 7 - Warrants (Detail) - Warrants Outstanding	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Mar. 31, 2013 Minimum [Member]	Dec. 31, 2012 Minimum [Member]	Mar. 31, 2012 Minimum [Member]	Dec. 31, 2011 Minimum [Member]	Mar. 31, 2013 Maximum [Member]	Dec. 31, 2012 Maximum [Member]	Mar. 31, 2012 Maximum [Member]	Dec. 31, 2011 Maximum [Member]
Outstanding (in Shares)	8,390,741		7,280,683
Outstanding	-		-	$0.125	$0.125	$0.125	$0.125	1.00	1.00	1.00	2.00
Issued (in Shares)	1,366,664	[1]	1,603,993
Issued	$0.55		$0.50
Expired (in Shares)	(1,225,898)
Expired	$1.00		$-
Outstanding (in Shares)	8,531,507		8,884,676
Outstanding	-		-	$0.125	$0.125	$0.125	$0.125	1.00	1.00	1.00	2.00

[1] During 2012, an adjustment was made to the timing of the issuance of warrants to purchase an aggregate 214,287 shares.