XML 80 R66.htm IDEA: XBRL DOCUMENT v3.20.4
Note 12 - Retirement Plans (Details Textual)
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Deferred Compensation Plan Assets $ 4,717,000 $ 5,150,000  
Retirement Plan Expense $ 1,600,000 $ 1,200,000 $ 900,000
Defined Contribution Plan [Member]      
Company Matching Percentage on First Eight Percent of Employee Contributions 50.00%    
Company Matching Percentage on First Six Percent of Employee Contributions   50.00% 50.00%
Employee Contribution Percentage for Which Company Will Match at Fifty Percent 8.00% 6.00% 6.00%
Defined Contribution Plan Number of Investment Options 23    
Pension Plan [Member]      
Number of Non-contributory Defined Benefit Plans 2    
Liability, Defined Benefit Plan, Total $ 1,600,000 $ 1,600,000  
Accumulated Other Comprehensive Income (Loss), Unrecognized Net Actuarial Losses, Net of Tax 1,800,000 1,800,000  
Defined Benefit Plan, Accumulated Benefit Obligation 6,500,000 6,400,000  
Defined Benefit Plan, Plan Assets, Amount, Ending Balance 4,900,000 4,800,000  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ 0 $ 0 $ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.04% 2.83%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 7.00% 7.50%  
Non-qualified Retirement Savings Plan [Member]      
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    
Non-qualified Retirement Savings Plan [Member] | Other Long-term Liabilities [Member]      
Deferred Compensation Liability, Classified, Noncurrent, Total 4,700,000 $ 5,200,000  
Non-qualified Retirement Savings Plan [Member] | Other Noncurrent Assets [Member]      
Deferred Compensation Plan Assets $ 4,700,000 $ 5,200,000