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Note 8 - Employee Benefit Plans (Details Textual) - USD ($)
$ in Thousands
 6 Months Ended 18 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Pension Plan [Member]        
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 0  
Supplemental Employee Retirement Plan [Member]        
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 800 $ 800    
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 800   800  
Defined Benefit Plan, Benefit Obligation, Ending Balance $ 22,800   $ 22,800 $ 22,800