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Note 1 - Organization and Operations (Details Textual)
12 Months Ended
Jan. 09, 2020
USD ($)
Nov. 12, 2015
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
shares
Severance Costs     $ 2,900,000  
Cash, Cash Equivalents, and Short-term Investments, Total     6,200,000  
Retained Earnings (Accumulated Deficit), Ending Balance     $ (225,462,000) $ (210,470,000)
Common Stock [Member]        
Stock Issued During Period, Shares, New Issues | shares       37,364
Sales Agreement [Member] | Cowen and Company, LLC [Member] | Common Stock [Member]        
Sale of Stock, Maximum Value of Stock Offered   $ 40,000,000    
Sale of Stock, Commission to Sales Agent, Percentage       3.00%
Sales Agreement [Member] | New Leaf Venture Partners LLC [Member] | Common Stock [Member]        
Stock Issued During Period, Shares, New Issues | shares       1,494,579
Proceeds from Issuance of Common Stock       $ 3,000,000
Payments of Stock Issuance Costs       $ 46,000
Reverse Merger with Private ArTara [Member] | Subsequent Event [Member]        
Business Combination, Consideration Transferred, Equity Interested Issued, Exchange Ratio 0.190756      
Reverse Merger with Private ArTara [Member] | Subsequent Event [Member] | Proteon Private Placement [Member]        
Proceeds from Issuance or Sale of Equity, Total $ 40,500,000      
Reverse Merger with Private ArTara [Member] | Subsequent Event [Member] | The ArTara Private Placement Shares [Member]        
Proceeds from Issuance or Sale of Equity, Total 2,000,000      
Reverse Merger with Private ArTara [Member] | Subsequent Event [Member] | The Private Placements [Member]        
Proceeds from Issuance or Sale of Equity, Total 42,500,000      
Sale of Stock, Consideration Received on Transaction $ 39,600,000      
Reverse Stock Split [Member] | Reverse Merger with Private ArTara [Member] | Subsequent Event [Member]        
Stockholders' Equity Note, Stock Split, Conversion Ratio 40