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Note 11 - 2020 Cash Incentive Bonus Plan (Details Textual) - Cash Incentive Bonus Plan [Member]
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 31, 2020
USD ($)
Cash Bonus Incentive, Incremental Amounts 14 11  
Performance Plan, Minimum Number of Days Valuation Milestone Must be Achieved and Maintained (Day) 20 days    
Percentage Valuation Milestone Cash Bonus Award Subject to Approval and Adjustment 67.00%    
Cash Incentive Bonus Award     $ 6,500
Share-Based Payment Arrangement, Expense, after Tax   $ 0  
Payments for Cash Incentive Bonus   0  
Minimum [Member]      
Performance Plan, Valuation Milestone Amount $ 200,000 74,900  
Cash Incentive Bonus Award, Exceeds Maximum 111,400    
Maximum [Member]      
Performance Plan, Valuation Milestone Amount 5,000,000 $ 202,300  
Cash Incentive Bonus Award, Exceeds Maximum $ 289,700