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Note 15 - Employee Benefit Plans (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Contribution Plan, Cost $ 770,000 $ 740,000 $ 750,000
Self-insured Health Insurance Program, Stop Loss Amount 225,000    
Deferred Compensation Liability, Classified, Noncurrent 2,030,000 1,682,000  
Assets for Plan Benefits, Defined Benefit Plan $ 2,000,000 $ 1,800,000