Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share, Basic, Total (in dollars per share)	$ 0.19	$ 0.01	$ 0.49	$ (0.83)
Share-based Payment Arrangement, Noncash Expense, Total			$ 25,794	$ 55,989
Shares Based Compensation, Stock Options Unamortized Fair Value			$ 8,600
Share-based Compensation, Weighted Average Remaining Amortization Period (Year)			5 years