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Note 8 - Long-term Debt - Long-term Debt (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Long-term debt	$ 12,916,667	$ 0
Avenue Ventures Note Payable [Member]
Long-term debt	$ 12,916,667	$ 0

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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