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Note 7 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 29, 2021
Sep. 04, 2019
Mar. 31, 2022
Mar. 31, 2021
Aug. 06, 2019
Proceeds from Issuance of Common Stock     $ 0 $ 2,000  
Underwriters [Member]          
Stock Issued During Period, Shares, New Issues (in shares)   75,000      
Purchase Agreement with Lincoln Park [Member]          
Sale of Stock, Aggregate Value, Maximum $ 20,000        
Stock Issued During Period, Shares, New Issues (in shares) 373,832   0    
Stock Issuable, Commitment Shares on Pro Rata Basis (in shares) 50,000        
Shares Issued, Price Per Share (in dollars per share) $ 5.35        
Proceeds from Issuance of Common Stock $ 2,000        
Stock Issued During the Period, Shares, Commission Fees (in shares) 80,000        
Stock Issued During the Period, Commitment Shares Issued on Pro Rata Basis (in shares) 5,000        
Conditional Issuance, Maximum Number of Shares Allowed to be Purchased (in shares) 100,000        
Stock Purchase Agreement Accelerated Purchase, Maximum, Percent of Shares Purchased on the Same Trading Day 300.00%        
Stock Purchase Agreement Accelerated Purchase, Maximum, Percent of Total Common Shares Traded During Specified Period 30.00%        
Maximum Number of Shares Allowed to be Issued Including Commitment Shares (in shares) 3,266,177        
Percentage of Common Stock Outstanding 19.99%        
Private Placement Unit [Member]          
Number of Common Stock in Each Unit (in shares)         1