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Note 6 - Note Payable - Summary of Note Payable (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
[1]
Less: Unamortized debt discount $ (10,000)  
Note payable, noncurrent portion 4,377,000 $ 3,983,000
The 2017 Loan Agreement [Member]    
2020 (remaining 3 months)  
2021  
2022  
2023 5,992,000  
Total payments 5,992,000  
Less: Amount representing interest (1,605,000)  
Present value of obligations 4,387,000  
Less: Unamortized debt discount (10,000)  
Note payable, noncurrent portion $ 4,377,000  
[1] The condensed consolidated balance sheet as of December 31, 2019 has been derived from the audited consolidated financial statements as of that date.