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Note 8 - Commitments and Contingencies (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
Mar. 31, 2021
Jan. 15, 2021
Dec. 31, 2020
Apr. 16, 2020
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 1.63   $ 1.63  
TLF Bio Innovation 2021 Warrants [Member]        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   15,000    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.6718    
Warrants in Connection with Microprofit Agreement [Member]        
Class of Warrant or Right, Number of Securities Callable by Warrants or Rights Represented as Percentage of Company’s Outstanding Common Stock       12.00%
KBSIII Towers [Member]        
Lessee, Operating Lease, Renewal Term (Year) 5 years      
Prepaid Expenses and Other Current Assets [Member]        
Insurance Reimbursement $ 0.3