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Notes (Details Narrative) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2021
Aug. 28, 2020
Jun. 27, 2018
Jun. 18, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Short-term Debt [Line Items]                
Interest and Debt Expense         $ 221,227 $ 340,602 $ 378,841 $ 679,967
Debt Issuance Costs, Net $ 236,913       $ 236,913   $ 236,913  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.01       $ 0.01   $ 0.01  
Initial Horizon Credit Agreement Amendment [Member]                
Short-term Debt [Line Items]                
Amortization of Debt Issuance Costs         $ 102,126 96,727 $ 139,428 192,793
Interest Expense, Debt         105,607 $ 243,299 225,920 $ 486,597
Horizon Technology Finance Corporation [Member]                
Short-term Debt [Line Items]                
Long-term Line of Credit $ 5,425,000     $ 5,000,000 5,425,000   $ 5,425,000  
[custom:EndOfTermFees] 275,000              
SVB Loan Facility [Member]                
Short-term Debt [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity       10,000,000        
Proceeds from Lines of Credit       6,000,000        
Restricted cash       6,000,000.0        
Line of Credit Facility, Remaining Borrowing Capacity       $ 4,000,000        
Debt Instrument, Interest Rate, Stated Percentage       3.25%        
Final payment percentage       3.00%        
Long-term Line of Credit       $ 10,000,000        
Line of Credit Facility, Commitment Fee Amount       $ 0        
Debt Conversion, Converted Instrument, Warrants or Options Issued       0        
Debt Instrument, Description       Payments under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of principal and interest through the scheduled maturity date.     Payments under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of principal and interest through the scheduled maturity date.  
Interest and Debt Expense       $ 243,370        
End of term charge percentage       3.00%        
Amortization of Debt Issuance Costs       $ 300,000        
Interest Expense, Debt             $ 7,042  
Amortization of Debt Issuance Costs and Discounts             6,457  
Initial Horizon Credit Agreement [Member]                
Short-term Debt [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity     $ 10,000,000          
Proceeds from Lines of Credit     10,000,000          
Line of Credit Facility, Remaining Borrowing Capacity     5,000,000          
Interest and Debt Expense     $ 175,000          
End of term charge percentage     4.00%          
Debt Instrument, Fee Amount     $ 142,605          
Loan Processing Fee     100,000          
Debt Instrument, Unamortized Discount     782,116          
Debt Issuance Costs, Net     400,000          
Fair Value Adjustment of Warrants     507,116          
[custom:EndOfTermFees]     $ 275,000          
Initial Horizon Credit Agreement [Member] | Common Stock [Member]                
Short-term Debt [Line Items]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     190,114          
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 2.63          
Class of Warrant or Right, Outstanding     95,057          
Amendment to Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member]                
Short-term Debt [Line Items]                
Repayments of Notes Payable   $ 5,000,000            
Debt instrument related end term charges   200,000            
Debt Instrument, Face Amount   $ 5,000,000            
Debt Instrument, Interest Rate Terms   The obligations bore interest at a rate calculated based an amount by which the one-month LIBOR exceeds 2% plus 7.625%. In no event shall the interest rate be less than 9.625%. Payments pursuant to the Amendment were interest only for the first twelve (12) months after August 1, 2020, followed by a 21-month amortization period of principal and interest through the scheduled maturity date on April 1, 2023. In addition, the remaining $5 million in obligations was subject to an end of term fee equal, in the aggregate, to $            
Debt Instrument, Fee Amount   $ 275,000            
Debt Instrument, Restrictive Covenants   In connection with the Amendment, Celsion agreed to a liquidity covenant which provides that, at all times, Celsion shall maintain unrestricted cash and/or cash equivalents on deposit in accounts over which the applicable Lenders maintain an account control agreement in an amount not less than $2.5 million. In addition, pursuant to the Amendment, Celsion agreed to provide evidence to Horizon on or before March 31, 2021, that it received aggregate cash proceeds of not less than $5 million from the sale of equity, debt, its New Jersey net operating losses, or a combination thereof, subsequent to the date of the Amendment.            
Debt Instrument, Unamortized Discount $ 109,706 $ 200,000     $ 109,706   109,706  
Debt Issuance Costs, Net   5,000            
Payment for Debt Extinguishment or Debt Prepayment Cost   5,000,000            
Warrants Not Settleable in Cash, Fair Value Disclosure   $ 247,548            
Amendment to Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member] | Common Stock [Member]                
Short-term Debt [Line Items]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   247,525            
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 1.01            
Warrants cancelled   95,057            
Horizon Credit Agreement [Member]                
Short-term Debt [Line Items]                
Interest Expense, Debt             190,581  
Gain (Loss) on Contract Termination             $ 234,419  
Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member]                
Short-term Debt [Line Items]                
Debt Instrument, Face Amount   $ 10,000,000