Note 9 - Stockholders' Equity (Details) - Waived Warrants					6 Months Ended
	Jun. 30, 2013	May 30, 2013	Feb. 26, 2013	Dec. 31, 2012	Jun. 30, 2013 2/26/2018 [Member]	Jun. 30, 2013 7/25/2016 [Member]	Jun. 30, 2013 7/6/2016 [Member]	Jun. 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)	13,828,622	6,294,674		7,863,653	5,955,736	140,593	56,827	141,518
Expiration Date of Warrants					Feb. 26, 2018	Jul. 25, 2016	Jul. 06, 2016	Nov. 25, 2017
Strike Price	2.42		1.18	3.37	1.18	4.22	3.13	2.77	1.4670	0.9791	1.0693	1.2353
Per Share Fair Value	2.42		1.18	3.37	1.18	4.22	3.13	2.77	1.4670	0.9791	1.0693	1.2353