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Note 9 - Per Share Data - Reconciliation of the Basic and Diluted Loss Per Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net loss	$ (361,049)	$ (812,105)
Less: Gain from change in fair value of warrants	351,104	918,801
Net loss, adjusted for change in fair value of warrants for diluted earnings per share	$ (712,153)	$ (1,730,906)
Weighted average shares outstanding: basic (in shares)	73,070,565	76,757,010
Effect of potential common shares (in shares)	812,493	815,577
Weighted-average shares: diluted (in shares)	73,883,058	77,572,587
Basic loss per share (in dollars per share)	$ (0.00)	$ (0.01)
Diluted loss per share (in dollars per share)	$ (0.01)	$ (0.02)

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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