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Note 12 - Retirement Plans (Details Textual)
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Company Matching Percentage on First Six Percent of Employee Contributions 50.00%    
Employee Contribution Percentage for Which Company Will Match at Fifty Percent 6.00%    
Defined Contribution Plan Number of Investment Options 24    
Number of Non-contributory Defined Benefit Plans 2    
Liability, Defined Benefit Plan $ 1,700,000 $ 1,900,000  
Accumulated Other Comprehensive Income (Loss), Unrecognized Net Actuarial Losses, Net of Tax 1,400,000 1,500,000  
Defined Benefit Plan, Accumulated Benefit Obligation 6,600,000 6,500,000  
Defined Benefit Plan, Fair Value of Plan Assets 4,900,000 4,600,000  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 0 $ 400,000 $ 400,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.36% 3.74%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 7.50% 7.50%  
Company Matching Percentage on First Ten Thousand Dollar Employee Contributions 50.00%    
Officer Contribution for Which Company Will Match at Fifty Percent $ 10,000    
Select Employee Contribution for Which Company Will Match at Fifty Percent $ 5,000    
Retirement Target Benefit Plan, Percentage of Final Base Pay after 35-year Career 35.00%    
Retirement Target Benefit Plan, Percentage of Final Base Pay per Year of Service 1.00%    
Non-qualified Retirement Savings Plan Actuarial Yearly Asset Growth Percentage Assumption 8.00%    
Deferred Compensation Liability, Current and Noncurrent $ 6,200,000 $ 6,200,000  
Retirement Plan Expense $ 900,000 $ 1,400,000 1,500,000
Income (Loss) From Operations of Discontinued Operations [Member]      
Retirement Plan Expense     $ 100,000