Note 6 - Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards		$ 1.9
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate on Cash and Certain Current Assets		15.50%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate on Remaining Earnings, Percent		8.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ (0.7)
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Foreign Tax Authority [Member]
Tax Credit Carryforward, Amount		$ 0.4