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Note 12 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Expense (Benefit)   $ (2,613) $ 1,498 $ (6,817)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00% 35.00% 35.00%
Increase (Decrease) in Deferred Tax Liabilities Resulting From Tax Act   $ (6,200)    
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount     $ 900  
Income Taxes Paid, Net   9,400 $ 1,000 $ 600
Restatement Adjustment [Member]        
Income Tax Expense (Benefit)   $ (1,900)    
Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%