Note 4 - Income Tax Matters (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			28.00%	41.00%
Income Tax Expense (Benefit), Total	$ 56,265	$ (130,031)	$ 22,925	$ (92,764)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			$ 2,921	$ 2,170