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Note 6 - Claims Liabilities (Details Textual) - USD ($)
Dec. 31, 2023
Sep. 01, 2020
Aug. 31, 2020
Self Insurance Auto Liability Claims Threshold Amount   $ 2,000,000  
Workers Compensation Self Insured Retention $ 500,000    
Workers Compensation Per Occurrence Excess Policy 500,000    
Stop Loss for Self Insurance for Employee Health Claims Per Covered Employee Per Year 400,000    
Cargo Loss Coverage [Member]      
Per Occurrence Deductibles 10,000    
Auto Liability Coverage [Member]      
Self Insurance Auto Liability Claims Threshold Amount $ 2,000,000   $ 1,000,000