Note 4 - Income Tax Matters (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Expense (Benefit), Total	$ 36,835	$ 68,812
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 3,084	$ 9,901
Forecast [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	31.00%