Note 7 - Warrants (Details) - Warrants Outstanding	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Class of Warrant or Right [Line Items]
Outstanding	10,618,771	8,390,741		5,077,086
Issued	3,503,328	6,398,813	[1]
Issued		$0.50
Expired	(1,275,298)	(2,870,871)
Minimum [Member]
Class of Warrant or Right [Line Items]
Outstanding	$0.125	$0.125		$0.125
Issued	$0.25
Expired	$0.50	$0.75
Maximum [Member]
Class of Warrant or Right [Line Items]
Outstanding	$1.00	$1.00		$ 1.00
Issued	$0.50
Expired	$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.