Note 11 - Warrant Transactions (Details) - Warrant Summary						12 Months Ended
	Dec. 31, 2013	Mar. 05, 2013	Dec. 31, 2012	Feb. 19, 2010	Jan. 25, 2008	Dec. 31, 2013 Venture Lending & Leasing VI, Inc.[Member]	Dec. 31, 2012 Venture Lending & Leasing VI, Inc.[Member]	Dec. 31, 2013 Venture Lending & Leasing VII, Inc.[Member]	Dec. 31, 2012 Venture Lending & Leasing VII, Inc.[Member]	Dec. 31, 2013 Scott, Richard L. Series #2 [Member]	Dec. 31, 2012 Scott, Richard L. Series #2 [Member]	Dec. 31, 2013 Scott, Richard L. Series #3 [Member]	Dec. 31, 2012 Scott, Richard L. Series #3 [Member]	Dec. 31, 2013 Allen, F. Stephen Series #2 [Member]	Dec. 31, 2012 Allen, F. Stephen Series #2 [Member]	Dec. 31, 2013 Allen, F. Stephen Series #3 [Member]	Dec. 31, 2012 Allen, F. Stephen Series #3 [Member]	Dec. 31, 2013 Stearns, Robert [Member]	Dec. 31, 2012 Stearns, Robert [Member]	Dec. 31, 2013 MATT Series #1 [Member]	Dec. 31, 2012 MATT Series #1 [Member]	Dec. 31, 2013 MATT Series #2 [Member]	Dec. 31, 2012 MATT Series #2 [Member]
Note 11 - Warrant Transactions (Details) - Warrant Summary [Line Items]
Number of warrants	3,111,690		4,200,000			255,102		255,102			500,000		500,000	500,000	500,000	500,000	500,000	200,000	200,000	401,486	1,000,000	1,000,000	1,000,000
Weighted- average exercise price per share	2.61	2.75	2.98	3.55	2.75	1.96		1.96		2.75		2.75		3.55		3.55		3.55		2.75		2.75
Expiration						2/28/2024		2/28/2024		3/21/2016		3/21/2016		3/21/2016		3/21/2016		3/21/2016		9/19/2016		9/19/2016
Balance sheet classification						Liability	N/A	Liability	N/A	N/A	Equity	N/A	Equity	Equity	Equity	Equity	Equity	Equity	Equity	Equity	Equity	Equity	Equity