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Note 6 - Claims Liabilities (Details Textual) - USD ($)
Dec. 31, 2020
Sep. 01, 2020
Dec. 31, 2019
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   $ 430,000  
Stop Loss for Self Insurance for Employee Health Claims Per Covered Employee Per Year 350,000      
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 310,000      
Certificates of Deposit, at Carrying Value $ 300,000