Note 6 - Note Payable - Summary of Note Payable (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Less: Unamortized debt discount	$ (4,000)
Note payable, current portion	5,285,000	$ 0
The 2017 Loan Agreement [Member]
2022 (remaining nine months)	0
2023	5,992,000
Total payments	5,992,000
Less: Amount representing interest	(703,000)
Present value of obligations	5,289,000
Less: Unamortized debt discount	(4,000)
Note payable, current portion	$ 5,285,000

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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Amount, after accumulated amortization, of debt discount.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in remainder of current fiscal year.

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Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

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