Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets, Tax Credit Carryforwards, Total	$ 294,000	$ 757,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 805,000
Deferred Tax Assets, Gross, Total	$ 755,000	1,964,000
Deferred Tax Assets, Valuation Allowance, Total	475,000	1,964,000
Unrecognized Tax Benefits, Ending Balance	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	0	0
Liability for Uncertainty in Income Taxes, Current	0	0
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$ 0	$ 0