Note 7 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Effective Income Tax Rate Reconciliation, Percent, Total	1.50%	(21.40%)	18.90%	552.30%
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense			$ 34,000
Income Tax Expense (Benefit), Total	$ 2,361	$ (6,727)	(170,775)	$ 12,399
Unrecognized Tax Benefits, Ending Balance	0		0
Deferred Tax Assets, Valuation Allowance, Total	$ 34,000		$ 34,000