Note 7 - Note Payable - Summary of Note Payable (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Less: Unamortized debt discount	$ (9,000)
Note payable, noncurrent portion	4,518,000	$ 3,983,000
The 2017 Loan Agreement [Member]
2021
2022
2023	5,992,000
Total payments	5,992,000
Less: Amount representing interest	(1,465,000)
Present value of obligations	4,527,000
Less: Unamortized debt discount	(9,000)
Note payable, noncurrent portion	$ 4,518,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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