Note 1 - Basis of Presentation - Basic and Diluted Loss Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic net loss	$ (273,185)	$ (337,632)	$ (770,004)	$ (575,017)
Add back: Gain on change in fair value of derivative liabilities	0	0	0	(22,252)
Diluted net loss	$ (273,185)	$ (337,632)	$ (770,004)	$ (597,269)
Weighted average basic shares outstanding (in shares)	18,377,318	18,014,580	18,292,604	17,925,910
Shares issuable from convertible credit line payable (in shares)	0	0	0	148,328
Dilutive shares (in shares)	18,377,318	18,014,580	18,292,604	18,074,238
Basic (in dollars per share)	$ (0.01)	$ (0.02)	$ (0.04)	$ (0.03)
Diluted (in dollars per share)	$ (0.01)	$ (0.02)	$ (0.04)	$ (0.03)