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Note 6 - Long-term Debt - Notes Payable (Details) - Senior Promissory Notes [Member] - USD ($)	Mar. 31, 2023	Dec. 31, 2022	Jun. 22, 2022
Senior Promissory Notes	$ 6,000,000	$ 6,000,000	$ 6,000,000.0
Less: unamortized debt discount	(435,158)	(519,686)	$ (695,749)
Senior Promissory Notes payable	5,564,842	5,480,314
Current portion of Senior Promissory Notes payable	0	0
Senior Promissory Notes payable, less current portion	$ 5,564,842	$ 5,480,314

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