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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, 2017
Income Tax Expense (Benefit), Total $ 2,684 $ 1,700  
Effective Income Tax Rate Reconciliation, Percent, Total 26.00% 18.10%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%   35.00%
Restatement Adjustment [Member]      
Income Tax Expense (Benefit), Total     $ (1,900)