Note 10 - Fair Value Measurements (Details) - Level 3 Instruments (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance December 31, 2012	$ 11,898,000
Issuances	7,193,000
December 31, 2013	7,217,000
Amortization of debt discount [Member] | Convertible Notes [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts Recognized on Income Statement	95,000
Amortization of debt discount [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts Recognized on Income Statement	95,000
Debt extinguishment and modification of warrants [Member] | Convertible Notes [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts Recognized on Income Statement	1,826,000
Debt extinguishment and modification of warrants [Member] | Warrant [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts Recognized on Income Statement	1,448,000
Debt extinguishment and modification of warrants [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts Recognized on Income Statement	3,274,000
Conversion of debentures and warrants [Member] | Convertible Notes [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts Recognized on Income Statement	(810,000)
Conversion of debentures and warrants [Member] | Warrant [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts Recognized on Income Statement	(2,655,000)
Conversion of debentures and warrants [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts Recognized on Income Statement	(3,465,000)
Fair value adjustments [Member] | Convertible Notes [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts Recognized on Income Statement	(4,814,000)
Fair value adjustments [Member] | Warrant [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts Recognized on Income Statement	(6,964,000)
Fair value adjustments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts Recognized on Income Statement	(11,778,000)
Convertible Notes [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance December 31, 2012	8,098,000
Issuances	142,000
December 31, 2013	4,537,000
Warrant [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance December 31, 2012	3,800,000
Issuances	7,051,000
December 31, 2013	$ 2,680,000