Note 6 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Effective Income Tax Rate Reconciliation, Percent, Total	0.50%	1.50%	(10.90%)	(18.90%)
Income Tax Expense (Benefit), Total	$ 6,929	$ 2,361	$ (232,000)	$ (170,775)
Unrecognized Tax Benefits, Ending Balance	$ 0		$ 0