Note 7 - Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Balance at January 1	$ 0	$ 0
Increase related to prior year tax positions	36,000	0
Increase related to current year tax positions	60,000	0
Balance at December 31	$ 96,000	$ 0