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Note 6 - Claims Liabilities (Details Textual) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Sep. 01, 2020
Sep. 01, 2019
Self Insurance Auto Liability Claims Threshold Amount       $ 2,000,000.0 $ 1,000,000.0
Workers Compensation Self Insured Retention $ 500,000        
Workers Compensation Per Occurrence Excess Policy 500,000        
Letters of Credit Outstanding, Amount 310,000 $ 310,000      
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   $ 2,000,000.0 $ 1,000,000.0    
Workers Compensation Coverage [Member]          
Letters of Credit Outstanding, Amount 300,000        
Certificates of Deposit, at Carrying Value $ 300,000