Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	35.00%
Net Operating Loss	$ 300	$ 200
Income Tax Expense (Benefit), Continuing Operations, Valuation Allowance on Foreign Tax Credits and Net Operating Losses	5,300	2,800
Effective Income Tax Rate Reconciliation, Changes in Tax Laws Included in Tax Act, Amount			$ (5,800)
Effective Income Tax Rate Reconciliation, Effect of Decrease in Federal Tax Rate on Deferred Taxes, Amount			(10,036)
Effective Income Tax Rate Reconciliation, Change in Valuation Allowance on Pre-2017 Foreign Tax Credits, Amount	5,277	2,811	1,276
Effective Income Tax Rate Reconciliation, Non-creditable 2017 Foreign Tax, Amount	515		2,903
Unrecognized Tax Benefits, Ending Balance			$ 15
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 0	$ 0