Note 9 - Stockholders' Equity (Details) - Waived Warrants					9 Months Ended
	Sep. 30, 2013	May 30, 2013	Feb. 26, 2013	Dec. 31, 2012	Sep. 30, 2013 2/26/2018 [Member]	Sep. 30, 2013 7/25/2016 [Member]	Sep. 30, 2013 7/6/2016 [Member]	Sep. 30, 2013 11/25/2017 [Member]	Jun. 03, 2013 Estimate of Fair Value Measurement [Member] 2/26/2018 [Member]	Jun. 03, 2013 Estimate of Fair Value Measurement [Member] 7/25/2016 [Member]	Jun. 03, 2013 Estimate of Fair Value Measurement [Member] 7/6/2016 [Member]	Jun. 03, 2013 Estimate of Fair Value Measurement [Member] 11/25/2017 [Member]
Class of Warrant or Right [Line Items]
Shares of common stock associated with the Waived Warrants (in Shares)	3,073,027	1,398,816		1,747,478	1,323,496	31,243	12,628	31,448
Expiration Date of Warrants					Feb. 26, 2018	Jul. 25, 2016	Jul. 06, 2016	Nov. 25, 2017
Strike Price	10.89		5.31	15.17	5.31	18.99	14.09	12.47	6.60	4.41	4.81	5.56
Per Share Fair Value	10.89		5.31	15.17	5.31	18.99	14.09	12.47	6.60	4.41	4.81	5.56