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Note 13 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00% 35.00% 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ (28,434)    
Adjustment to Deferred Income Tax Expense (Benefit)   (28,434)    
Provisional Expense (Benefit)   (700)    
Increase (Decrease) in Income Taxes Payable   (1,750)    
Increase (Decrease) in Deferred Tax Liabilities   1,050    
Deferred Tax Assets, Net, Noncurrent   3,238 $ 3,337  
Deferred Tax Liabilities, Net, Noncurrent   43,789 17,278  
Tax Credit Carry Forward State Research and Development   13,089    
Tax Credit Carryforward State Manufacturing   4,618    
Deferred Tax Assets, Valuation Allowance   6,817 4,362  
Unrecognized Tax Benefits, Interest on Income Taxes Expense   131 272 $ 174
Unrecognized Tax Benefits, Income Tax Penalties Expense   220 $ 425 $ 363
State and Local Jurisdiction [Member]        
Deferred Tax Assets, Valuation Allowance   $ 1,171    
Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%