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Note 9 - Common Stock (Details) - Outstanding Stock Purchase Warrants	Dec. 31, 2013	May 14, 2013	Apr. 30, 2013	Jan. 17, 2013	Dec. 31, 2012
Class of Warrant or Right [Line Items]
Number of Shares, Warrants	8,292,226
Weighted Average Exercise Price, Warrants	2.07	0.50	0.60	0.60	0.75
Warrants Expiration 1 [Member]
Class of Warrant or Right [Line Items]
Number of Shares, Warrants	7,400
Weighted Average Exercise Price, Warrants	1.40
Warrants Expiration 2 [Member]
Class of Warrant or Right [Line Items]
Number of Shares, Warrants	818,376
Weighted Average Exercise Price, Warrants	16.50
Warrants Expiration 3 [Member]
Class of Warrant or Right [Line Items]
Number of Shares, Warrants	987,783
Weighted Average Exercise Price, Warrants	1.00
Warrants Expiration 4 [Member]
Class of Warrant or Right [Line Items]
Number of Shares, Warrants	45,000
Weighted Average Exercise Price, Warrants	1.00
Warrants Expiration 5 [Member]
Class of Warrant or Right [Line Items]
Number of Shares, Warrants	567,001
Weighted Average Exercise Price, Warrants	1.00
Warrants Expiration 6 [Member]
Class of Warrant or Right [Line Items]
Number of Shares, Warrants	5,866,666
Weighted Average Exercise Price, Warrants	0.35