Note 9 - Loss Per Share - Shares Used in Basic and Diluted Loss Per Common Share Computations (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net loss attributable to common stockholders: basic and diluted calculation		$ (3,923,368)	$ (10,391,324)	$ (7,345,170)	$ (13,762,039)
Weighted average shares used in computation – basic and diluted (in shares)		3,996,512	3,589,684	3,982,384	3,441,546
Effect of diluted stock options, warrants, and preferred stock (1) (in shares)	[1]	0	0	0	0
Weighted average common shares outstanding - diluted (in shares)		3,996,512	3,589,684	3,982,384	3,441,546
Net loss per common share – basic and diluted (in dollars per share)		$ (0.98)	$ (2.89)	$ (1.84)	$ (4.00)

[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: 23 Three and Six Months Ended June 30, 2023 2022 Options 48,037 51,763 Restricted Stock Units 2,500 18,334 Warrants 1,812,379 1,819,927 Series B Convertible Preferred Stock 16 16