Note 4 - Income Tax Matters (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Total	$ 18,275	$ (22,696)	$ 127,364	$ 139,064
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			$ 47,032	$ 63,260
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent						35.00%
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, Percent, Total					32.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					21.00%