Note 9 - Stockholders' Equity (Details) - Waived Warrants									12 Months Ended
	Dec. 31, 2013	Oct. 28, 2013	Oct. 27, 2013	May 30, 2013	Feb. 26, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 2/26/2018 [Member]	Dec. 31, 2013 7/25/2016 [Member]	Dec. 31, 2013 7/6/2016 [Member]	Dec. 31, 2013 11/25/2017 [Member]	Oct. 28, 2013 Estimate of Fair Value Measurement [Member] 2/26/2018 [Member]	Jun. 03, 2013 Estimate of Fair Value Measurement [Member] 2/26/2018 [Member]	Oct. 28, 2013 Estimate of Fair Value Measurement [Member] 7/25/2016 [Member]	Jun. 03, 2013 Estimate of Fair Value Measurement [Member] 7/25/2016 [Member]	Oct. 28, 2013 Estimate of Fair Value Measurement [Member] 7/6/2016 [Member]	Jun. 03, 2013 Estimate of Fair Value Measurement [Member] 7/6/2016 [Member]	Oct. 28, 2013 Estimate of Fair Value Measurement [Member] 11/25/2017 [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)	3,268,013	3,100,000	13,800,000	1,398,816		1,749,667	2,577,470	224,239	1,323,496	31,243	12,628	31,448
Expiration Date of Waived Warrants									Feb. 26, 2018	Jul. 25, 2016	Jul. 06, 2016	Nov. 25, 2017
Strike Price					5.31	15.17	1,418	23.58	5.31	18.99	14.09	12.47	3.86	6.60	2.10	4.41	2.40	4.81	3.16	5.56
Per Share Fair Value on June 3, 2013 Price					5.31	15.17	1,418	23.58	5.31	18.99	14.09	12.47	3.86	6.60	2.10	4.41	2.40	4.81	3.16	5.56