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Note 7 - Note Payable - Summary of Note Payable (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
[1]
Less: Unamortized debt discount $ (5,000)  
Note payable, noncurrent portion 5,124,000 $ 4,518,000
The 2017 Loan Agreement [Member]    
2022 0  
2023 5,992,000  
Total Payments 5,992,000  
Less: Amount representing interest (863,000)  
Present value of obligations 5,129,000  
Less: Unamortized debt discount (5,000)  
Note payable, noncurrent portion $ 5,124,000  
[1] The condensed consolidated balance sheet as of December 31, 2020 has been derived from the audited consolidated financial statements as of that date.