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Note 6 - Note Payable - Summary of Note Payable (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
[1]
Less: Unamortized debt discount $ (8,000)  
Note payable, noncurrent portion 4,660,000 $ 4,518,000
The 2017 Loan Agreement [Member]    
2021 (remaining 9 months)  
2022  
2023 5,992,000  
Total payments 5,992,000  
Less: Amount representing interest (1,324,000)  
Present value of obligations 4,668,000  
Less: Unamortized debt discount (8,000)  
Note payable, noncurrent portion $ 4,660,000  
[1] The condensed consolidated balance sheet as of December 31, 2020 has been derived from the audited consolidated financial statements as of that date.