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Note 9 - Incentive Plans (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Jun. 04, 2024
Jun. 01, 2023
Jun. 01, 2022
Nov. 04, 2021
Jul. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Oct. 31, 2024
Share-Based Payment Arrangement, Expense           $ 12,701,000 $ 25,957,000 $ 33,352,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross             1,949,000 1,564,500  
Share-Based Payment Arrangement, Option [Member]                  
Share-Based Payment Arrangement, Expense           86,000 $ 11,000,000 $ 18,100,000  
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount           0      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross         1,949,000        
Restricted Stock [Member]                  
Share-Based Payment Arrangement, Expense           6,000,000 $ 7,200,000 7,200,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)       1,500,500          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       3 years          
Restricted Stock [Member] | Outside Directors [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 53,879 58,767 21,184       58,767    
Restricted Stock [Member] | Outside Directors [Member] | June 1, 2023 [Member]                  
Share-Based Payment Arrangement, Expense           442,000      
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount           316,000      
Restricted Stock [Member] | Outside Directors [Member] | June 1, 2022 [Member]                  
Share-Based Payment Arrangement, Expense           316,000 $ 442,000 284,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     67,779            
Restricted Stock [Member] | Outside Directors [Member] | June 1, 2021 [Member]                  
Share-Based Payment Arrangement, Expense             305,000 427,000  
Contractual Equity-based Bonus [Member]                  
Share-Based Payment Arrangement, Expense           $ 5,900,000 7,000,000 7,300,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)     600,000            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number                 2,100,500
The 401K Plan [Member]                  
Defined Contribution Plan, Period of Employment for Eligibility (Month)           3 months      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent           80.00%      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match           100.00%      
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay           4.00%      
Defined Contribution Plan, Employer Discretionary Contribution Amount           $ 353,000 $ 218,000 $ 358,000