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Note 11 - Income Taxes (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2019
Effective Income Tax Rate Before Discretion, at Federal Statutory Income Tax Rate, Percent     28.00%    
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ 1.2        
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount $ 13.8        
Tax Period, Repatriation of Foreign Earnings 8 years        
Effective Income Tax Rate Reconciliation, Percent 116.70% 17.90% 68.80% 23.10%  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount $ 15.0        
Scenario, Forecast [Member]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent         21.00%