Note 10 - Fair Value Measurements (Details) - Summary of Changes in Convertible Notes, Warrants, Options (USD $)	0 Months Ended	1 Months Ended	3 Months Ended	7 Months Ended	12 Months Ended
	Jan. 16, 2013	Feb. 22, 2013	Dec. 31, 2013	Sep. 18, 2013	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance	$ 11,898,000	$ 12,592,000	$ 13,537,000	$ 17,490,000	$ 11,898,000	$ 6,927,000
Amortization of debt discount		95,000			95,000	331,000
Allocation of initial proceeds	250,000					1,000,000
Fair value adjustment	444,000	(450,000)	(5,933,000)	(5,839,000)		3,640,000
December 31, 2013	12,592,000	17,490,000	7,217,000	13,537,000	7,217,000	11,898,000
Carrying value of old debt at modification		(8,137,000)		(4,680,000)
Fair value of new debt at modification		7,972,000		6,671,000
Conversion of debentures and warrants			(387,000)	(3,078,000)
Modification of warrants		2,548,000
Cancellation/retirement of warrants		(1,100,000)
Fair value of instruments at issuance		3,970,000		2,973,000
2011 Warrants [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance		2,000,000	1,048,000	3,916,000		1,600,000
Fair value adjustment			(604,000)	(716,000)		400,000
December 31, 2013		3,916,000	179,000	1,048,000	179,000	2,000,000
Conversion of debentures and warrants			(265,000)	(2,152,000)
Modification of warrants		1,916,000
2012 Warrants [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance		1,800,000	424,000	1,632,000
Allocation of initial proceeds						583,000
Fair value adjustment			(283,000)	(970,000)		1,217,000
December 31, 2013		1,632,000	141,000	424,000	141,000	1,800,000
Conversion of debentures and warrants				(238,000)
Modification of warrants		632,000
Cancellation/retirement of warrants		(800,000)
Third Tranche Warrants [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance		300,000
Allocation of initial proceeds	108,000
Fair value adjustment	192,000
December 31, 2013	300,000
Cancellation/retirement of warrants		(300,000)
February 2013 Warrants [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance			2,017,000	2,759,000
Fair value adjustment			(576,000)	(742,000)
December 31, 2013		2,759,000	1,441,000	2,017,000	1,441,000
Fair value of instruments at issuance		2,759,000
February 2013 SPA Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance			404,000	1,211,000
Fair value adjustment			(404,000)	(807,000)
December 31, 2013		1,211,000		404,000
Fair value of instruments at issuance		1,211,000
September 2013 Warrants [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance			1,807,000
Fair value adjustment			(1,180,000)
December 31, 2013			627,000	1,807,000	627,000
Fair value of instruments at issuance				1,807,000
September 2013 SPA Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance			1,166,000
Fair value adjustment			(874,000)
December 31, 2013			292,000	1,166,000	292,000
Fair value of instruments at issuance				1,166,000
2011 Convertible Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance		6,510,000	4,920,000	6,070,000		5,327,000
Amortization of debt discount		38,000				265,000
Fair value adjustment		(370,000)	(1,508,000)	(1,932,000)		918,000
December 31, 2013		6,070,000	3,290,000	4,920,000	3,290,000	6,510,000
Carrying value of old debt at modification		(6,178,000)		(3,450,000)
Fair value of new debt at modification		6,070,000		4,920,000
Conversion of debentures and warrants			(122,000)	(688,000)
2012 Convertible Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance		1,588,000	1,390,000	1,516,000
Amortization of debt discount		55,000				66,000
Allocation of initial proceeds						417,000
Fair value adjustment		(72,000)	(380,000)	(536,000)		1,105,000
December 31, 2013		1,516,000	1,010,000	1,390,000	1,010,000	1,588,000
Carrying value of old debt at modification		(1,571,000)		(980,000)
Fair value of new debt at modification		1,516,000		1,390,000
Third Tranche Convertible Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance		394,000	361,000	386,000
Amortization of debt discount		2,000
Allocation of initial proceeds	142,000
Fair value adjustment	252,000	(8,000)	(124,000)	(136,000)
December 31, 2013	394,000	386,000	237,000	361,000	237,000
Carrying value of old debt at modification		(388,000)		(250,000)
Fair value of new debt at modification		$ 386,000		$ 361,000