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Note 11 - Warrant Transactions (Details) - Modified Warrants Fair Value Assumptions
12 Months Ended
Dec. 31, 2013
Venture Lending & Leasing VI and VII [Member]
 
Note 11 - Warrant Transactions (Details) - Modified Warrants Fair Value Assumptions [Line Items]  
Risk-free interest rate 3.04%
Expected term 10 years 62 days
Expected volatility 93.15%
Scott, Richard L Series #2 and #3 [Member]
 
Note 11 - Warrant Transactions (Details) - Modified Warrants Fair Value Assumptions [Line Items]  
Risk-free interest rate 2.81%
Expected term 8 years 54 days
Expected volatility 100.75%
Allen, F. Stephen Series #2 and #3 [Member]
 
Note 11 - Warrant Transactions (Details) - Modified Warrants Fair Value Assumptions [Line Items]  
Risk-free interest rate 3.24%
Expected term 6 years 29 days
Expected volatility 94.07%
MATT Warrants [Member]
 
Note 11 - Warrant Transactions (Details) - Modified Warrants Fair Value Assumptions [Line Items]  
Risk-free interest rate 2.81%
Expected term 8 years 266 days
Expected volatility 100.75%