Note 11 - Warrant Transactions (Details) - Warrant Summary				3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014 Venture Lending & Leasing VI, Inc.[Member]	Dec. 31, 2013 Venture Lending & Leasing VI, Inc.[Member]	Mar. 31, 2014 Venture Lending & Leasing VII, Inc.[Member]	Dec. 31, 2013 Venture Lending & Leasing VII, Inc.[Member]	Mar. 31, 2014 Allen, F. Stephen Series #2 [Member]	Dec. 31, 2013 Allen, F. Stephen Series #2 [Member]	Mar. 31, 2014 Allen, F. Stephen Series #3 [Member]	Dec. 31, 2013 Allen, F. Stephen Series #3 [Member]	Mar. 31, 2014 Stearns, Robert [Member]	Dec. 31, 2013 Stearns, Robert [Member]	Mar. 31, 2006 Stearns, Robert [Member]	Mar. 31, 2014 MATT Series #1 [Member]	Dec. 31, 2013 MATT Series #1 [Member]	Mar. 31, 2014 MATT Series #2 [Member]	Dec. 31, 2013 MATT Series #2 [Member]
Note 11 - Warrant Transactions (Details) - Warrant Summary [Line Items]
Number of warrants	2,812,414	3,111,690	3,111,690	170,919	255,102	170,919	255,102	500,000	500,000	500,000	500,000	200,000	200,000		270,576	401,486	1,000,000	1,000,000
Weighted- average exercise price per share	3.00		2.61	1.96		1.96		3.55		3.55		3.55		3.55	2.75		2.75
Expiration				Feb. 28, 2024		Feb. 28, 2024		Mar. 21, 2016		Mar. 21, 2016		Mar. 21, 2016			Sep. 19, 2016		Sep. 19, 2016
Balance sheet classification				Liability	Liability	Liability	Liability	Equity	Equity	Equity	Equity	Equity	Equity		Equity	Equity	Equity	Equity