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Note 14 - Celsion Employee Benefit Plans (Details Textual)
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Minimum Age For Employee Benefit Plan 21  
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 3.00%  
Defined Benefit Plan, Contributions by Employer $ 82,391 $ 80,408