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Note 13 - Benefit Plans (Details Textual) - USD ($)
$ in Millions
 12 Months Ended 81 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay       5.00%
Defined Contribution Plan, Cost $ 2.6 $ 2.3 $ 2.2  
Interest Expense, Deferred Compensation Plan $ 0.1 $ 0.1 $ 0.1  
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) 1,194 1,410 1,388  
Common Stock Including Additional Paid in Capital [Member]        
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) 1,194 1,410    
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) 233,000     233,000
Other Liabilities [Member]        
Deferred Compensation Liability, Current and Noncurrent $ 1.3 $ 1.1   $ 1.3