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Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00% 35.00%
Net Operating Loss $ 200    
Income Tax Expense (Benefit), Continuing Operations, Valuation Allowance on Foreign Tax Credits and Net Operating Losses 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 2,811 1,276
Effective Income Tax Rate Reconciliation, Non-creditable 2017 Foreign Tax, Amount 2,903
Unrecognized Tax Benefits, Ending Balance 15 $ 117
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total $ 0 $ 0