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Note 15 - Employee Benefit Plans (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Contribution Plan, Cost $ 1,000 $ 1,100 $ 800
Self-insured Health Insurance Program, Stop Loss Amount 225    
Deferred Compensation Liability, Classified, Noncurrent, Total 2,788 2,044  
Assets for Plan Benefits, Defined Benefit Plan $ 2,800 $ 2,000