Note 7 - Loss Per Share - Shares Used in Basic and Diluted Loss Per Common Share Computations (Details) - USD ($)		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Net loss attributable to common stockholders: basic and diluted calculation		$ (3,421,802)	$ (3,370,715)
Weighted average shares used in computation - basic and diluted (in shares)	[1]	3,968,099	3,291,722
Effect of diluted stock options, warrants, and preferred stock (1) (in shares)		0	0
Weighted average common shares outstanding - diluted (in shares)		3,968,099	3,291,722
Net loss per common share - basic and diluted (in dollars per share)		$ (0.86)	$ (1.02)

[1] The following is a summary of the number of underlying shares outstanding at the end of the respective periods that have been excluded from the diluted calculations because the effect on loss per common share would have been anti-dilutive: Three Months Ended March 31, 2023 2022 Options 47,805 51,529 Restricted Stock Units 2,500 22,084 Warrants 1,812,379 1,583,063 Series B Convertible Preferred Stock 16 16