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Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Income Tax Expense (Benefit), Total $ 81 $ 130    
Effective Income Tax Rate Reconciliation, Percent, Total 16.40% 24.30%    
Deferred Tax Assets, Net, Total $ 5,900     $ 5,600
Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%