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Note 2 - Summary of Significant Accounting Policies - Potential Additional Dilutive Securities (Details)	9 Months Ended
	Sep. 30, 2023 shares
Conversion rate	0.2
Common shares after conversion (in shares)	654,000
Warrant [Member]
Warrant shares (in shares)	109,584
Share-Based Payment Arrangement, Nonemployee [Member]
Option shares (in shares)	211,875
Series A Preferred Stock [Member]
Convertible Preferred Shares (in shares)	3,269,998
Series B Preferred Stock [Member]
Convertible Preferred Shares (in shares)	2,400,000

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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