Note 16 - Subsequent Events	12 Months Ended
Dec. 31, 2013
Subsequent Events [Abstract]
Subsequent Events [Text Block]	16. SUBSEQUENT EVENTS On January 15, 2014, the Company entered into a Securities Purchase Agreement with certain institutional investors, pursuant to which Celsion agreed to sell, in a registered offering, an aggregate of 3,603,604 shares of its common stock, par value $0.01 per share, and warrants to purchase up to 1,801,802 shares of Common Stock, for an aggregate purchase price of approximately $15 million. The shares of common stock and warrants were sold in units, with each unit consisting of one share of common stock, a Series A warrant to purchase 0.25 share of common stock and a Series B warrant to purchase 0.25 share of common stock. Each unit was sold at a purchase price of $4.1625. Each Series A warrant will be exercisable at any time on or after its issuance date and until the five-year anniversary of the issuance date. Each Series B warrant will be exercisable at any time on or after its issuance date and until the one-year anniversary of the issuance date. Each warrant has an exercise price of $4.10 per share. Under the purchase agreement, Celsion is prohibited, for a period of nine months after the closing, from effecting or entering into an agreement to issue Common Stock or any other securities that are at any time convertible into, or exercisable or exchangeable for, or otherwise entitle the holder thereof to receive, Common Stock to the extent such issuance or sale involves certain variable conversion, exercise or exchange prices or such agreement provides for sale of securities at a price to be determined in the future. This offering was made pursuant to the Company’s previously filed and effective registration statement on Form S-3 (File No. 333-183286), the base prospectus dated September 14, 2012 filed as part of such registration statement, and the prospectus supplement filed by Celsion with the Securities and Exchange Commission on January 21, 2014.

Note 16 - Subsequent Events

12 Months Ended

Dec. 31, 2013

16. SUBSEQUENT EVENTS

On January 15, 2014, the Company entered into a Securities Purchase Agreement with certain institutional investors, pursuant to which Celsion agreed to sell, in a registered offering, an aggregate of 3,603,604 shares of its common stock, par value $0.01 per share, and warrants to purchase up to 1,801,802 shares of Common Stock, for an aggregate purchase price of approximately $15 million. The shares of common stock and warrants were sold in units, with each unit consisting of one share of common stock, a Series A warrant to purchase 0.25 share of common stock and a Series B warrant to purchase 0.25 share of common stock. Each unit was sold at a purchase price of $4.1625. Each Series A warrant will be exercisable at any time on or after its issuance date and until the five-year anniversary of the issuance date. Each Series B warrant will be exercisable at any time on or after its issuance date and until the one-year anniversary of the issuance date. Each warrant has an exercise price of $4.10 per share. Under the purchase agreement, Celsion is prohibited, for a period of nine months after the closing, from effecting or entering into an agreement to issue Common Stock or any other securities that are at any time convertible into, or exercisable or exchangeable for, or otherwise entitle the holder thereof to receive, Common Stock to the extent such issuance or sale involves certain variable conversion, exercise or exchange prices or such agreement provides for sale of securities at a price to be determined in the future. This offering was made pursuant to the Company’s previously filed and effective registration statement on Form S-3 (File No. 333-183286), the base prospectus dated September 14, 2012 filed as part of such registration statement, and the prospectus supplement filed by Celsion with the Securities and Exchange Commission on January 21, 2014.