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Note 6 - Claims Liabilities (Details Textual)
Dec. 31, 2018
USD ($)
Workers Compensation Self Insured Retention $ 500,000
Workers Compensation Per Occurrence Excess Policy 500,000
Letters of Credit Outstanding, Amount 700,000
Stop Loss for Self Insurance for Employee Health Claims Per Covered Employee Per Year 325,000
Cargo Loss Coverage [Member]  
Per Occurrence Deductibles 10,000
Auto Liability Coverage [Member]  
Per Occurrence Deductibles 2,500
Trailers [Member]  
Per Occurrence Deductibles 2,500
Workers Compensation Coverage [Member]  
Letters of Credit Outstanding, Amount 515,000
Certificates of Deposit, at Carrying Value $ 300,000