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Note 13 - Benefit Plans (Details Textual) - USD ($)
$ in Millions
 12 Months Ended 69 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2023
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay       5.00%
Defined Contribution Plan, Cost $ 2.3 $ 2.2 $ 2.1  
Interest Expense, Deferred Compensation Plan $ 0.1 $ 0.1 $ 0.1  
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) 1,410 1,388 1,481  
Common Stock Including Additional Paid in Capital [Member]        
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) 1,410 1,388    
Stock Purchase Plan [Member]        
Common Stock, Capital Shares Reserved for Future Issuance (in shares) 250,000     250,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 234,500     234,500
Other Liabilities [Member]        
Deferred Compensation Liability, Current and Noncurrent $ 1.1 $ 1.1   $ 1.1